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Volumn 110, Issue 45, 2013, Pages 18274-18278

Early-life stress has persistent effects on amygdala function and development in mice and humans

Author keywords

Anxiety; C fos; Cross species; Emotion regulation; Infralimbic cortex

Indexed keywords

ANTIDEPRESSANT AGENT; BENZODIAZEPINE; PROTEIN C FOS;

EID: 84887312427     PISSN: 00278424     EISSN: 10916490     Source Type: Journal    
DOI: 10.1073/pnas.1310163110     Document Type: Article
Times cited : (237)

References (51)
  • 1
    • 74049126628 scopus 로고    scopus 로고
    • Prevalence and treatment of mental disorders among us children in the 2001-2004 nhanes
    • Merikangas KR, et al. (2010) Prevalence and treatment of mental disorders among US children in the 2001-2004 NHANES. Pediatrics 125(1):75-81.
    • (2010) Pediatrics , vol.125 , Issue.1 , pp. 75-81
    • Merikangas, K.R.1
  • 2
    • 76149141815 scopus 로고    scopus 로고
    • Childhood adversities and adult psychiatric disorders in the national comorbidity survey replication i: Associations with first onset of dsm-iv disorders
    • Green JG, et al. (2010) Childhood adversities and adult psychiatric disorders in the national comorbidity survey replication I: Associations with first onset of DSM-IV disorders. Arch Gen Psychiatry 67(2):113-123.
    • (2010) Arch Gen Psychiatry , vol.67 , Issue.2 , pp. 113-123
    • Green, J.G.1
  • 3
    • 18944378510 scopus 로고    scopus 로고
    • Behavior problems and mental health referrals of international adoptees: A meta-analysis
    • Juffer F, van Ijzendoorn MH (2005) Behavior problems and mental health referrals of international adoptees: A meta-analysis. JAMA 293(20):2501-2515.
    • (2005) JAMA , vol.293 , Issue.20 , pp. 2501-2515
    • Juffer, F.1    Van Ijzendoorn, M.H.2
  • 4
    • 79952280719 scopus 로고    scopus 로고
    • Effects of early life stress on cognitive and affective function: An integrated review of human literature
    • Berl
    • Pechtel P, Pizzagalli DA (2011) Effects of early life stress on cognitive and affective function: An integrated review of human literature. Psychopharmacology (Berl) 214(1):55-70.
    • (2011) Psychopharmacology , vol.214 , Issue.1 , pp. 55-70
    • Pechtel, P.1    Pizzagalli, D.A.2
  • 5
    • 84855255591 scopus 로고    scopus 로고
    • Committee on psychosocial aspects of child and family health; committee on early childhood, adoption, and dependent care; section on developmental and behavioral pediatrics (2012) the lifelong effects of early childhood adversity and toxic stress
    • Shonkoff JP, Garner AS; Committee on Psychosocial Aspects of Child and Family Health; Committee on Early Childhood, Adoption, and Dependent Care; Section on Developmental and Behavioral Pediatrics (2012) The lifelong effects of early childhood adversity and toxic stress. Pediatrics 129(1):e232-e246.
    • Pediatrics , vol.129 , Issue.1
    • Shonkoff, J.P.1    Garner, A.S.2
  • 6
    • 66449097460 scopus 로고    scopus 로고
    • Neuroscience, molecular biology, and the childhood roots of health disparities: Building a new framework for health promotion and disease prevention
    • Shonkoff JP, Boyce WT, McEwen BS (2009) Neuroscience, molecular biology, and the childhood roots of health disparities: Building a new framework for health promotion and disease prevention. JAMA 301(21):2252-2259.
    • (2009) JAMA , vol.301 , Issue.21 , pp. 2252-2259
    • Shonkoff, J.P.1    Boyce, W.T.2    McEwen, B.S.3
  • 7
    • 72249105126 scopus 로고    scopus 로고
    • Prolonged institutional rearing is associated with atypically large amygdala volume and difficulties in emotion regulation
    • Tottenham N, et al. (2010) Prolonged institutional rearing is associated with atypically large amygdala volume and difficulties in emotion regulation. Dev Sci 13(1):46-61.
    • (2010) Dev Sci , vol.13 , Issue.1 , pp. 46-61
    • Tottenham, N.1
  • 8
    • 79954575088 scopus 로고    scopus 로고
    • Elevated amygdala response to faces following early deprivation
    • Tottenham N, et al. (2011) Elevated amygdala response to faces following early deprivation. Dev Sci 14(2):190-204.
    • (2011) Dev Sci , vol.14 , Issue.2 , pp. 190-204
    • Tottenham, N.1
  • 9
    • 70350077701 scopus 로고    scopus 로고
    • Amygdala, hippocampal and corpus callosum size following severe early institutional deprivation: The english and romanian adoptees study pilot
    • Mehta MA, et al. (2009) Amygdala, hippocampal and corpus callosum size following severe early institutional deprivation: The English and Romanian Adoptees study pilot. J Child Psychol Psychiatry 50(8):943-951.
    • (2009) J Child Psychol Psychiatry , vol.50 , Issue.8 , pp. 943-951
    • Mehta, M.A.1
  • 10
    • 77955070860 scopus 로고    scopus 로고
    • Deprivation-specific psychological patterns
    • Kumsta R, et al. (2010) Deprivation-specific psychological patterns. Monogr Soc Res Child Dev 75(1):48-78.
    • (2010) Monogr Soc Res Child Dev , vol.75 , Issue.1 , pp. 48-78
    • Kumsta, R.1
  • 11
    • 77955077669 scopus 로고    scopus 로고
    • Iv. Developmental course of deprivation-specific psychological patterns: Early manifestations, persistence to age 15, and clinical features
    • Kreppner J, et al. (2010) IV. Developmental course of deprivation-specific psychological patterns: Early manifestations, persistence to age 15, and clinical features. Monogr Soc Res Child Dev 75(1):79-101.
    • (2010) Monogr Soc Res Child Dev , vol.75 , Issue.1 , pp. 79-101
    • Kreppner, J.1
  • 12
    • 84864039762 scopus 로고    scopus 로고
    • Risk and developmental heterogeneity in previously institutionalized children
    • Tottenham N (2012) Risk and developmental heterogeneity in previously institutionalized children. J Adolesc Health 51(2 Suppl):S29-S33.
    • (2012) J Adolesc Health , vol.51 , Issue.2 SUPPL.
    • Tottenham, N.1
  • 13
    • 0347062605 scopus 로고    scopus 로고
    • English and romanian adoptees (era) study team (2004) are there biological programming effects for psychological development? Findings from a study of romanian adoptees
    • Rutter M, O'Connor TG; English and Romanian Adoptees (ERA) Study Team (2004) Are there biological programming effects for psychological development? Findings from a study of Romanian adoptees. Dev Psychol 40(1):81-94.
    • Dev Psychol , vol.40 , Issue.1 , pp. 81-94
    • Rutter, M.1    O'Connor, T.G.2
  • 14
    • 0030249912 scopus 로고    scopus 로고
    • Abnormal corticosterone regulation in an immature rat model of continuous chronic stress
    • Gilles EE, Schultz L, Baram TZ (1996) Abnormal corticosterone regulation in an immature rat model of continuous chronic stress. Pediatr Neurol 15(2):114-119.
    • (1996) Pediatr Neurol , vol.15 , Issue.2 , pp. 114-119
    • Gilles, E.E.1    Schultz, L.2    Baram, T.Z.3
  • 15
    • 53249109683 scopus 로고    scopus 로고
    • A novel mouse model for acute and long-lasting consequences of early life stress
    • Rice CJ, Sandman CA, Lenjavi MR, Baram TZ (2008) A novel mouse model for acute and long-lasting consequences of early life stress. Endocrinology 149(10):4892-4900.
    • (2008) Endocrinology , vol.149 , Issue.10 , pp. 4892-4900
    • Rice, C.J.1    Sandman, C.A.2    Lenjavi, M.R.3    Baram, T.Z.4
  • 16
    • 58849162391 scopus 로고    scopus 로고
    • Psychosocial stress reversibly disrupts prefrontal processing and attentional control
    • Liston C, McEwen BS, Casey BJ (2009) Psychosocial stress reversibly disrupts prefrontal processing and attentional control. Proc Natl Acad Sci USA 106(3):912-917.
    • (2009) Proc Natl Acad Sci USA , vol.106 , Issue.3 , pp. 912-917
    • Liston, C.1    McEwen, B.S.2    Casey, B.J.3
  • 17
    • 0036703905 scopus 로고    scopus 로고
    • Chronic stress induces contrasting patterns of dendritic remodeling in hippocampal and amygdaloid neurons
    • Vyas A, Mitra R, Shankaranarayana Rao BS, Chattarji S (2002) Chronic stress induces contrasting patterns of dendritic remodeling in hippocampal and amygdaloid neurons. J Neurosci 22(15):6810-6818.
    • (2002) J Neurosci , vol.22 , Issue.15 , pp. 6810-6818
    • Vyas, A.1    Mitra, R.2    Shankaranarayana, R.B.S.3    Chattarji, S.4
  • 18
    • 84872249346 scopus 로고    scopus 로고
    • Brain on stress: How the social environment gets under the skin
    • McEwen BS (2012) Brain on stress: How the social environment gets under the skin. Proc Natl Acad Sci USA 109(Suppl 2):17180-17185.
    • (2012) Proc Natl Acad Sci USA , vol.109 , Issue.SUPPL. 2 , pp. 17180-17185
    • McEwen, B.S.1
  • 19
    • 4644266979 scopus 로고    scopus 로고
    • Recovery after chronic stress fails to reverse amygdaloid neuronal hypertrophy and enhanced anxiety-like behavior
    • Vyas A, Pillai AG, Chattarji S (2004) Recovery after chronic stress fails to reverse amygdaloid neuronal hypertrophy and enhanced anxiety-like behavior. Neuroscience 128(4):667-673.
    • (2004) Neuroscience , vol.128 , Issue.4 , pp. 667-673
    • Vyas, A.1    Pillai, A.G.2    Chattarji, S.3
  • 20
    • 33845342923 scopus 로고    scopus 로고
    • Effects of repeated maternal separation on anxiety- and depression-related phenotypes in differentmouse strains
    • Millstein RA, Holmes A (2007) Effects of repeated maternal separation on anxiety- and depression-related phenotypes in differentmouse strains. Neurosci Biobehav Rev 31(1):3-17.
    • (2007) Neurosci Biobehav Rev , vol.31 , Issue.1 , pp. 3-17
    • Millstein, R.A.1    Holmes, A.2
  • 21
    • 60449117336 scopus 로고    scopus 로고
    • Risk and resilience: Early manipulation of macaque social experience and persistent behavioral and neurophysiological outcomes
    • Stevens HE, Leckman JF, Coplan JD, Suomi SJ (2009) Risk and resilience: Early manipulation of macaque social experience and persistent behavioral and neurophysiological outcomes. J Am Acad Child Adolesc Psychiatry 48(2):114-127.
    • (2009) J Am Acad Child Adolesc Psychiatry , vol.48 , Issue.2 , pp. 114-127
    • Stevens, H.E.1    Leckman, J.F.2    Coplan, J.D.3    Suomi, S.J.4
  • 22
    • 33745898549 scopus 로고    scopus 로고
    • Enriched environment experience overcomes thememory deficits and depressive-like behavior induced by early life stress
    • Cui M, et al. (2006) Enriched environment experience overcomes thememory deficits and depressive-like behavior induced by early life stress. Neurosci Lett 404(1-2):208-212.
    • (2006) Neurosci Lett , vol.404 , Issue.1-2 , pp. 208-212
    • Cui, M.1
  • 23
    • 84870855378 scopus 로고    scopus 로고
    • Associations between parenting behavior and anxiety in a rodent model and a clinical sample: Relationship to peripheral bdnf levels
    • Dalle Molle R, et al. (2012) Associations between parenting behavior and anxiety in a rodent model and a clinical sample: Relationship to peripheral BDNF levels. Transcult Psychiatry 2:e195.
    • (2012) Transcult Psychiatry , vol.2
    • Dalle Molle, R.1
  • 24
    • 79952900821 scopus 로고    scopus 로고
    • Early-life stress, corpus callosum development, hippocampal volumetrics, and anxious behavior inmale nonhuman primates
    • Jackowski A, et al. (2011) Early-life stress, corpus callosum development, hippocampal volumetrics, and anxious behavior inmale nonhuman primates. Psychiatry Res 192(1):37-44.
    • (2011) Psychiatry Res , vol.192 , Issue.1 , pp. 37-44
    • Jackowski, A.1
  • 25
    • 84861608757 scopus 로고    scopus 로고
    • Effects of early-life abuse differ across development: Infant social behavior deficits are followed by adolescent depressive- like behaviors mediated by the amygdala
    • Raineki C, Cortés MR, Belnoue L, Sullivan RM (2012) Effects of early-life abuse differ across development: Infant social behavior deficits are followed by adolescent depressive- like behaviors mediated by the amygdala. J Neurosci 32(22):7758-7765.
    • (2012) J Neurosci , vol.32 , Issue.22 , pp. 7758-7765
    • Raineki, C.1    Cortés, M.R.2    Belnoue, L.3    Sullivan, R.M.4
  • 26
    • 0034257617 scopus 로고    scopus 로고
    • International adoption of institutionally reared children: Research and policy
    • Gunnar MR, Bruce J, Grotevant HD (2000) International adoption of institutionally reared children: Research and policy. Dev Psychopathol 12(4):677-693.
    • (2000) Dev Psychopathol , vol.12 , Issue.4 , pp. 677-693
    • Gunnar, M.R.1    Bruce, J.2    Grotevant, H.D.3
  • 27
    • 46549086320 scopus 로고    scopus 로고
    • Dysfunctional nurturing behavior in rat dams with limited access to nesting material: A clinically relevant model for earlylife stress
    • Ivy AS, Brunson KL, Sandman C, Baram TZ (2008) Dysfunctional nurturing behavior in rat dams with limited access to nesting material: A clinically relevant model for earlylife stress. Neuroscience 154(3):1132-1142.
    • (2008) Neuroscience , vol.154 , Issue.3 , pp. 1132-1142
    • Ivy, A.S.1    Brunson, K.L.2    Sandman, C.3    Baram, T.Z.4
  • 28
    • 4544256595 scopus 로고    scopus 로고
    • Windows of vulnerability to psychopathology and therapeutic strategy in the adolescent rodent model
    • Adriani W, Laviola G (2004) Windows of vulnerability to psychopathology and therapeutic strategy in the adolescent rodent model. Behav Pharmacol 15(5-6):341-352.
    • (2004) Behav Pharmacol , vol.15 , Issue.5-6 , pp. 341-352
    • Adriani, W.1    Laviola, G.2
  • 30
    • 0034056125 scopus 로고    scopus 로고
    • The adolescent brain and age-related behavioral manifestations
    • Spear LP (2000) The adolescent brain and age-related behavioral manifestations. Neurosci Biobehav Rev 24(4):417-463.
    • (2000) Neurosci Biobehav Rev , vol.24 , Issue.4 , pp. 417-463
    • Spear, L.P.1
  • 31
    • 79960069326 scopus 로고    scopus 로고
    • Developmental trajectories during adolescence in males and females: A cross-species understanding of underlying brain changes
    • Brenhouse HC, Andersen SL (2011) Developmental trajectories during adolescence in males and females: A cross-species understanding of underlying brain changes. Neurosci Biobehav Rev 35(8):1687-1703.
    • (2011) Neurosci Biobehav Rev , vol.35 , Issue.8 , pp. 1687-1703
    • Brenhouse, H.C.1    Andersen, S.L.2
  • 32
    • 42649120665 scopus 로고    scopus 로고
    • Biological substrates of emotional reactivity and regulation in adolescence during an emotional go-nogo task
    • Hare TA, et al. (2008) Biological substrates of emotional reactivity and regulation in adolescence during an emotional go-nogo task. Biol Psychiatry 63(10):927-934.
    • (2008) Biol Psychiatry , vol.63 , Issue.10 , pp. 927-934
    • Hare, T.A.1
  • 33
    • 2942662069 scopus 로고    scopus 로고
    • Effects of chronic fluoxetine in animal models of anxiety and depression
    • Dulawa SC, Holick KA, Gundersen B, Hen R (2004) Effects of chronic fluoxetine in animal models of anxiety and depression. Neuropsychopharmacology 29(7):1321-1330.
    • (2004) Neuropsychopharmacology , vol.29 , Issue.7 , pp. 1321-1330
    • Dulawa, S.C.1    Holick, K.A.2    Gundersen, B.3    Hen, R.4
  • 34
    • 84872230029 scopus 로고    scopus 로고
    • Experience and the developing prefrontal cortex
    • Kolb B, et al. (2012) Experience and the developing prefrontal cortex. Proc Natl Acad Sci USA 109(Suppl 2):17186-17193.
    • (2012) Proc Natl Acad Sci USA , vol.109 , Issue.SUPPL. 2 , pp. 17186-17193
    • Kolb, B.1
  • 35
    • 80052164630 scopus 로고    scopus 로고
    • Larger amygdala but no change in hippocampal volume in 10- year-old children exposed to maternal depressive symptomatology since birth
    • Lupien SJ, et al. (2011) Larger amygdala but no change in hippocampal volume in 10- year-old children exposed to maternal depressive symptomatology since birth. Proc Natl Acad Sci USA 108(34):14324-14329.
    • (2011) Proc Natl Acad Sci USA , vol.108 , Issue.34 , pp. 14324-14329
    • Lupien, S.J.1
  • 36
    • 82955229598 scopus 로고    scopus 로고
    • Fear extinction as a model for translational neuroscience: Ten years of progress
    • Milad MR, Quirk GJ (2012) Fear extinction as a model for translational neuroscience: Ten years of progress. Annu Rev Psychol 63:129-151.
    • (2012) Annu Rev Psychol , vol.63 , pp. 129-151
    • Milad, M.R.1    Quirk, G.J.2
  • 37
    • 84867071678 scopus 로고    scopus 로고
    • Altered fear learning across development in both mouse and human
    • Pattwell SS, et al. (2012) Altered fear learning across development in both mouse and human. Proc Natl Acad Sci USA 109(40):16318-16323.
    • (2012) Proc Natl Acad Sci USA , vol.109 , Issue.40 , pp. 16318-16323
    • Pattwell, S.S.1
  • 38
    • 0034663007 scopus 로고    scopus 로고
    • The role of ventromedial prefrontal cortex in the recovery of extinguished fear
    • Quirk GJ, Russo GK, Barron JL, Lebron K (2000) The role of ventromedial prefrontal cortex in the recovery of extinguished fear. J Neurosci 20(16):6225-6231.
    • (2000) J Neurosci , vol.20 , Issue.16 , pp. 6225-6231
    • Quirk, G.J.1    Russo, G.K.2    Barron, J.L.3    Lebron, K.4
  • 39
    • 71649104325 scopus 로고    scopus 로고
    • Antidepressant-like effects of medial prefrontal cortex deep brain stimulation in rats
    • Hamani C, et al. (2010) Antidepressant-like effects of medial prefrontal cortex deep brain stimulation in rats. Biol Psychiatry 67(2):117-124.
    • (2010) Biol Psychiatry , vol.67 , Issue.2 , pp. 117-124
    • Hamani, C.1
  • 40
    • 68149092650 scopus 로고    scopus 로고
    • Reciprocal patterns of c-fos expression in the medial prefrontal cortex and amygdala after extinction and renewal of conditioned fear
    • Knapska E, Maren S (2009) Reciprocal patterns of c-Fos expression in the medial prefrontal cortex and amygdala after extinction and renewal of conditioned fear. Learn Mem 16(8):486-493.
    • (2009) Learn Mem , vol.16 , Issue.8 , pp. 486-493
    • Knapska, E.1    Maren, S.2
  • 41
    • 0024425142 scopus 로고
    • The use of c-fos as a metabolic marker in neuronal pathway tracing
    • Dragunow M, Faull R (1989) The use of c-fos as a metabolic marker in neuronal pathway tracing. J Neurosci Methods 29(3):261-265.
    • (1989) J Neurosci Methods , vol.29 , Issue.3 , pp. 261-265
    • Dragunow, M.1    Faull, R.2
  • 42
    • 47249122559 scopus 로고    scopus 로고
    • Overlapping and distinct brain regions associated with the anxiolytic effects of chlordiazepoxide and chronic fluoxetine
    • Bechtholt AJ, Valentino RJ, Lucki I (2008) Overlapping and distinct brain regions associated with the anxiolytic effects of chlordiazepoxide and chronic fluoxetine. Neuropsychopharmacology 33(9):2117-2130.
    • (2008) Neuropsychopharmacology , vol.33 , Issue.9 , pp. 2117-2130
    • Bechtholt, A.J.1    Valentino, R.J.2    Lucki, I.3
  • 43
    • 0023193514 scopus 로고
    • Mapping patterns of c-fos expression in the central nervous system after seizure
    • Morgan JI, Cohen DR, Hempstead JL, Curran T (1987) Mapping patterns of c-fos expression in the central nervous system after seizure. Science 237(4811):192-197.
    • (1987) Science , vol.237 , Issue.4811 , pp. 192-197
    • Morgan, J.I.1    Cohen, D.R.2    Hempstead, J.L.3    Curran, T.4
  • 44
    • 0029057882 scopus 로고
    • Linked regularities in the development and evolution of mammalian brains
    • Finlay BL, Darlington RB (1995) Linked regularities in the development and evolution of mammalian brains. Science 268(5217):1578-1584.
    • (1995) Science , vol.268 , Issue.5217 , pp. 1578-1584
    • Finlay, B.L.1    Darlington, R.B.2
  • 45
    • 0035849892 scopus 로고    scopus 로고
    • Neurophysiological investigation of the basis of the fmri signal
    • Logothetis NK, Pauls J, Augath M, Trinath T, Oeltermann A (2001) Neurophysiological investigation of the basis of the fMRI signal. Nature 412(6843):150-157.
    • (2001) Nature , vol.412 , Issue.6843 , pp. 150-157
    • Logothetis, N.K.1    Pauls, J.2    Augath, M.3    Trinath, T.4    Oeltermann, A.5
  • 46
    • 77953423831 scopus 로고    scopus 로고
    • Global and local fmri signals driven by neurons defined optogenetically by type and wiring
    • Lee JH, et al. (2010) Global and local fMRI signals driven by neurons defined optogenetically by type and wiring. Nature 465(7299):788-792.
    • (2010) Nature , vol.465 , Issue.7299 , pp. 788-792
    • Lee, J.H.1
  • 47
    • 84874626852 scopus 로고    scopus 로고
    • A developmental shift from positive to negative connectivity in human amygdala-prefrontal circuitry
    • Gee DG, et al. (2013) A developmental shift from positive to negative connectivity in human amygdala-prefrontal circuitry. J Neurosci 33(10):4584-4593.
    • (2013) J Neurosci , vol.33 , Issue.10 , pp. 4584-4593
    • Gee, D.G.1
  • 48
    • 76149103251 scopus 로고    scopus 로고
    • Childhood adversities and adult psychiatric disorders in the national comorbidity survey replication ii: Associations with persistence of dsm-iv disorders
    • McLaughlin KA, et al. (2010) Childhood adversities and adult psychiatric disorders in the national comorbidity survey replication II: Associations with persistence of DSM-IV disorders. Arch Gen Psychiatry 67(2):124-132.
    • (2010) Arch Gen Psychiatry , vol.67 , Issue.2 , pp. 124-132
    • McLaughlin, K.A.1
  • 49
    • 0031945718 scopus 로고    scopus 로고
    • English and romanian adoptees (era) study team (1998) developmental catch-up, and deficit, following adoption after severe global early privation
    • Rutter M; English and Romanian Adoptees (ERA) Study Team (1998) Developmental catch-up, and deficit, following adoption after severe global early privation. J Child Psychol Psychiatry 39(4):465-476.
    • J Child Psychol Psychiatry , vol.39 , Issue.4 , pp. 465-476
    • Rutter, M.1
  • 50
    • 33947523828 scopus 로고    scopus 로고
    • Amygdala gene expression correlates of social behavior in monkeys experiencing maternal separation
    • Sabatini MJ, et al. (2007) Amygdala gene expression correlates of social behavior in monkeys experiencing maternal separation. J Neurosci 27(12):3295-3304.
    • (2007) J Neurosci , vol.27 , Issue.12 , pp. 3295-3304
    • Sabatini, M.J.1
  • 51
    • 67650479583 scopus 로고    scopus 로고
    • The nimstim set of facial expressions: Judgments from untrained research participants
    • Tottenham N, et al. (2009) The NimStim set of facial expressions: Judgments from untrained research participants. Psychiatry Res 168(3):242-249.
    • (2009) Psychiatry Res , vol.168 , Issue.3 , pp. 242-249
    • Tottenham, N.1


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