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Volumn 80, Issue 8, 1999, Pages 1123-1131

Regulation and expression of multidrug resistance (MDR) transcripts in the intestinal epithelium

Author keywords

Differentiation; Gene expression; Intestine; Mdr1a; Mdr1b

Indexed keywords

MESSENGER RNA; MULTIDRUG RESISTANCE PROTEIN;

EID: 0033058197     PISSN: 00070920     EISSN: None     Source Type: Journal    
DOI: 10.1038/sj.bjc.6690475     Document Type: Article
Times cited : (22)

References (57)
  • 2
    • 0016815949 scopus 로고
    • Distribution of disaccharidases, alkaline phosphatase, and some intracellular enzymes along the human small intestine
    • Asp NG, Gudmand-Hoyer E, Andersen B, Berg NO and Dahlqvist A (1975) Distribution of disaccharidases, alkaline phosphatase, and some intracellular enzymes along the human small intestine. Scand J Gastroenterol 10: 647-651
    • (1975) Scand J Gastroenterol , vol.10 , pp. 647-651
    • Asp, N.G.1    Gudmand-Hoyer, E.2    Andersen, B.3    Berg, N.O.4    Dahlqvist, A.5
  • 3
    • 0030975889 scopus 로고    scopus 로고
    • Genetic dissection of the function of mammalian P-glycoproteins
    • Borst P and Schinkel AH (1997) Genetic dissection of the function of mammalian P-glycoproteins. Trends Genet 13:
    • (1997) Trends Genet , vol.13
    • Borst, P.1    Schinkel, A.H.2
  • 4
    • 0025681794 scopus 로고
    • Sex-dependent and independent expression of the P-glycoprotein isoforms in Chinese hamster
    • Bradley G, Georges E and Ling V (1990) Sex-dependent and independent expression of the P-glycoprotein isoforms in Chinese hamster. J Cell Physiol 145: 398-408
    • (1990) J Cell Physiol , vol.145 , pp. 398-408
    • Bradley, G.1    Georges, E.2    Ling, V.3
  • 5
    • 0026582066 scopus 로고
    • Quantitative expression patterns of multidrug-resistance P-glycoprotein (MDR1) and differentially spliced cystic fibrosis transmembrane-conductance regulator mRNA transcripts in human epithelia
    • Bremer S, Hoof T, Wilke M, Busche R, Scholte B, Riordan JR, Maass G and Tummler B (1992) Quantitative expression patterns of multidrug-resistance P-glycoprotein (MDR1) and differentially spliced cystic fibrosis transmembrane-conductance regulator mRNA transcripts in human epithelia. Eur J Biochem 206: 137-149
    • (1992) Eur J Biochem , vol.206 , pp. 137-149
    • Bremer, S.1    Hoof, T.2    Wilke, M.3    Busche, R.4    Scholte, B.5    Riordan, J.R.6    Maass, G.7    Tummler, B.8
  • 7
    • 0026640274 scopus 로고
    • mdr2 encodes P-glycoprotein expressed in the bile canalicular membrane as determined by isoform-specific antibodies
    • Buschman E, Arceci RJ, Croop JM, Che M, Arias IM, Housman DE and Gros P (1992) mdr2 encodes P-glycoprotein expressed in the bile canalicular membrane as determined by isoform-specific antibodies. J Biol Chem 267: 18093-18099
    • (1992) J Biol Chem , vol.267 , pp. 18093-18099
    • Buschman, E.1    Arceci, R.J.2    Croop, J.M.3    Che, M.4    Arias, I.M.5    Housman, D.E.6    Gros, P.7
  • 8
    • 0027378632 scopus 로고
    • In vitro cDNA amplification from individual intestinal crypts: A novel approach to the study of differential gene expression along the crypt-villus axis
    • Cano-Gauci DF, Lualdi JC, Ouellette AJ, Brady G, Iscove NN and Buick RN (1993) In vitro cDNA amplification from individual intestinal crypts: a novel approach to the study of differential gene expression along the crypt-villus axis. Exp Cell Res 208: 344-349
    • (1993) Exp Cell Res , vol.208 , pp. 344-349
    • Cano-Gauci, D.F.1    Lualdi, J.C.2    Ouellette, A.J.3    Brady, G.4    Iscove, N.N.5    Buick, R.N.6
  • 9
    • 0023277545 scopus 로고
    • Single-step method of RNA isolation by acid guanidinium thiocyanate phenol chloroform extraction
    • Chomezynski P and Sacchi N (1987) Single-step method of RNA isolation by acid guanidinium thiocyanate phenol chloroform extraction. Anal Biochem 162: 156-159
    • (1987) Anal Biochem , vol.162 , pp. 156-159
    • Chomezynski, P.1    Sacchi, N.2
  • 10
    • 0028987053 scopus 로고
    • Developmental regulation of alpha-fetoprotein expression in intestinal epithelial cells of transgenic mice
    • Cirillo LA, Emerson JA, Vacher J and Tyner AL (1995) Developmental regulation of alpha-fetoprotein expression in intestinal epithelial cells of transgenic mice. Dev Biol 168: 395-405
    • (1995) Dev Biol , vol.168 , pp. 395-405
    • Cirillo, L.A.1    Emerson, J.A.2    Vacher, J.3    Tyner, A.L.4
  • 11
    • 0027989871 scopus 로고
    • Identification of two nuclear protein binding sites and their role in the regulation of the murine multidrug resistance mdr1a promoter
    • Cohen D, Yu L, Rzepka R and Horwitz SB (1994) Identification of two nuclear protein binding sites and their role in the regulation of the murine multidrug resistance mdr1a promoter. DNA Cell Biol 13: 641-649
    • (1994) DNA Cell Biol , vol.13 , pp. 641-649
    • Cohen, D.1    Yu, L.2    Rzepka, R.3    Horwitz, S.B.4
  • 12
    • 0026688632 scopus 로고
    • Use of transgenic mice to map cis-acting elements in the intestinal fatty acid binding protein gene (Fabpi) that control its cell lineage-specific and regional patterns of expression along the duodenal-colonic and crypt-villus axes of the gut epithelium
    • Cohn SM, Simon TC, Roth KA, Birkenmeier EH and Gordon JI (1992) Use of transgenic mice to map cis-acting elements in the intestinal fatty acid binding protein gene (Fabpi) that control its cell lineage-specific and regional patterns of expression along the duodenal-colonic and crypt-villus axes of the gut epithelium. J Cell Biol 119: 27-44
    • (1992) J Cell Biol , vol.119 , pp. 27-44
    • Cohn, S.M.1    Simon, T.C.2    Roth, K.A.3    Birkenmeier, E.H.4    Gordon, J.I.5
  • 13
    • 0028149768 scopus 로고
    • NF-IL6, a member of the C/EBP family of transcription factors, binds and trans-activates the human MDR1 gene promoter
    • Combates NJ, Rzepka RW, Chen Y-NP and Cohen D (1994) NF-IL6, a member of the C/EBP family of transcription factors, binds and trans-activates the human MDR1 gene promoter. J Biol Chem 269: 29715-29719
    • (1994) J Biol Chem , vol.269 , pp. 29715-29719
    • Combates, N.J.1    Rzepka, R.W.2    Chen, Y.-N.P.3    Cohen, D.4
  • 14
    • 0027983038 scopus 로고
    • Repression versus activation in the control of gene transcription
    • Cowell IG (1994) Repression versus activation in the control of gene transcription. Trends Biochem Sci 19: 38-42
    • (1994) Trends Biochem Sci , vol.19 , pp. 38-42
    • Cowell, I.G.1
  • 15
    • 0024544045 scopus 로고
    • The three mouse multidrug resistance (mdr) genes are expressed in a tissue specific manner in normal mouse tissues
    • Croop JM, Raymond M, Haber D, Devault A, Arceci RJ, Gros P and Housman DE (1989) The three mouse multidrug resistance (mdr) genes are expressed in a tissue specific manner in normal mouse tissues. Mol Cell Biol 9: 1346-1350
    • (1989) Mol Cell Biol , vol.9 , pp. 1346-1350
    • Croop, J.M.1    Raymond, M.2    Haber, D.3    Devault, A.4    Arceci, R.J.5    Gros, P.6    Housman, D.E.7
  • 16
    • 0013624155 scopus 로고
    • Development of intestinal structure and function
    • American Physiological Society: Washington DC
    • Deren JJ (1987) Development of intestinal structure and function. In Handbook of Physiology. Vol. III - Intestinal absorption. American Physiological Society: Washington DC.
    • (1987) Handbook of Physiology. Vol. III - Intestinal Absorption
    • Deren, J.J.1
  • 17
    • 0026561813 scopus 로고
    • Identification of distinct P-glycoprotein gene sequences in rat
    • Deuchars KL, Duthic M and Ling V (1992) Identification of distinct P-glycoprotein gene sequences in rat. Biochim Biophys Acta 1130: 157-165
    • (1992) Biochim Biophys Acta , vol.1130 , pp. 157-165
    • Deuchars, K.L.1    Duthic, M.2    Ling, V.3
  • 18
    • 0021186181 scopus 로고
    • The gene family encoding the mouse ribosomal protein L32 contains a uniquely expressed intron-containing gene and an unmutated processed gene
    • Dudov KP and Perry RP (1984) The gene family encoding the mouse ribosomal protein L32 contains a uniquely expressed intron-containing gene and an unmutated processed gene. Cell 37: 457-468
    • (1984) Cell , vol.37 , pp. 457-468
    • Dudov, K.P.1    Perry, R.P.2
  • 19
    • 0023608484 scopus 로고
    • Simultaneous expression of two P-glycoprotein genes in drug-sensitive Chinese hamster ovary cells
    • Endicott JA, Juranka PF, Sarangi F, Gerlach JH, Deuchars KL and Ling V (1987) Simultaneous expression of two P-glycoprotein genes in drug-sensitive Chinese hamster ovary cells. Mol Cell Biol 7: 4075-4081
    • (1987) Mol Cell Biol , vol.7 , pp. 4075-4081
    • Endicott, J.A.1    Juranka, P.F.2    Sarangi, F.3    Gerlach, J.H.4    Deuchars, K.L.5    Ling, V.6
  • 21
    • 0027971693 scopus 로고
    • Isolation of rat pgp3 cDNA: Evidence for gender and zonal regulation of expression in the liver
    • Furuya KN, Gebhardt R, Schuetz EG and Schuetz JD (1994) Isolation of rat pgp3 cDNA: evidence for gender and zonal regulation of expression in the liver. Biochim Biophys Acta 1219: 636-644
    • (1994) Biochim Biophys Acta , vol.1219 , pp. 636-644
    • Furuya, K.N.1    Gebhardt, R.2    Schuetz, E.G.3    Schuetz, J.D.4
  • 22
    • 0027345980 scopus 로고
    • Structure and function of P-glycoprotein in normal liver and small intestine
    • Gatmaitan ZC and Arias IM (1993) Structure and function of P-glycoprotein in normal liver and small intestine. Adv Pharmacol 24: 77-97
    • (1993) Adv Pharmacol , vol.24 , pp. 77-97
    • Gatmaitan, Z.C.1    Arias, I.M.2
  • 23
    • 0027218689 scopus 로고
    • Biochemistry of multidrug resistance mediated by the multidrug transporter
    • Gottesman MM and Pastan I (1993) Biochemistry of multidrug resistance mediated by the multidrug transporter. Annu Rev Biochem 62: 385-427
    • (1993) Annu Rev Biochem , vol.62 , pp. 385-427
    • Gottesman, M.M.1    Pastan, I.2
  • 26
  • 27
    • 0025362517 scopus 로고
    • Structural analysis of the mouse mdr1a (P-glycoprotein) promoter reveals the basis for differential transcript heterogeneity in multidrug-resistant J774.2 cells
    • published erratum appears in Mol Cell Biol 1990 10: 6101
    • Hsu SI, Cohen D, Kirschner LS, Lothstein L, Hartstein M and Horwitz SB (1990) Structural analysis of the mouse mdr1a (P-glycoprotein) promoter reveals the basis for differential transcript heterogeneity in multidrug-resistant J774.2 cells [published erratum appears in Mol Cell Biol 1990 10: 6101]. Mol Cell Biol 10: 3596-3606
    • (1990) Mol Cell Biol , vol.10 , pp. 3596-3606
    • Hsu, S.I.1    Cohen, D.2    Kirschner, L.S.3    Lothstein, L.4    Hartstein, M.5    Horwitz, S.B.6
  • 28
    • 0027731969 scopus 로고
    • Isolation and characterization of the murine homeobox gene Cdx-1. Regulation of expression in intestinal epithelial cells
    • Hu Y, Kazenwadel J and James R (1993) Isolation and characterization of the murine homeobox gene Cdx-1. Regulation of expression in intestinal epithelial cells. J Biol Chem 268: 27214-27225
    • (1993) J Biol Chem , vol.268 , pp. 27214-27225
    • Hu, Y.1    Kazenwadel, J.2    James, R.3
  • 29
    • 0027185802 scopus 로고
    • Characterization of the cystic fibrosis transmembrane conductance regulator promoter region. Chromatin context and tissue-specificity
    • Koh J, Sferra TJ and Collins FS (1993) Characterization of the cystic fibrosis transmembrane conductance regulator promoter region. Chromatin context and tissue-specificity. J Biol Chem 268: 15912-15921
    • (1993) J Biol Chem , vol.268 , pp. 15912-15921
    • Koh, J.1    Sferra, T.J.2    Collins, F.S.3
  • 30
    • 0027493626 scopus 로고
    • Differential expression of P-glycoprotein genes in primary rat hepatocyte culture
    • Lee CH, Bradley G, Zhang JT and Ling V (1993) Differential expression of P-glycoprotein genes in primary rat hepatocyte culture. J Cell Physiol 157: 392-402
    • (1993) J Cell Physiol , vol.157 , pp. 392-402
    • Lee, C.H.1    Bradley, G.2    Zhang, J.T.3    Ling, V.4
  • 31
    • 0029127312 scopus 로고
    • Basal expression of the cystic fibrosis transmembrane conductance regulator gene is dependent on protein kinase A activity
    • McDonald RA, Matthews RP, Idzerda RL and McKnight GS (1995) Basal expression of the cystic fibrosis transmembrane conductance regulator gene is dependent on protein kinase A activity. Proc Natl Acad Sci USA 92: 7560-7564
    • (1995) Proc Natl Acad Sci USA , vol.92 , pp. 7560-7564
    • McDonald, R.A.1    Matthews, R.P.2    Idzerda, R.L.3    McKnight, G.S.4
  • 32
    • 0027483327 scopus 로고
    • Identification of 5′ and 3′ sequences involved in the regulation of transcription of the human mdr1 gene in vivo
    • Madden MJ, Morrow CS, Nakagawa M, Goldsmith ME, Fairchild CR and Cowan KH (1993) Identification of 5′ and 3′ sequences involved in the regulation of transcription of the human mdr1 gene in vivo. J Biol Chem 268: 8290-8297
    • (1993) J Biol Chem , vol.268 , pp. 8290-8297
    • Madden, M.J.1    Morrow, C.S.2    Nakagawa, M.3    Goldsmith, M.E.4    Fairchild, C.R.5    Cowan, K.H.6
  • 33
    • 0023950714 scopus 로고
    • Expression of the mdr (P-glycoprotein) gene in Chinese hamster digestive tracts
    • Mukhopadhyay T, Batsakis JG and Kuo MT (1988) Expression of the mdr (P-glycoprotein) gene in Chinese hamster digestive tracts. J Natl Cancer Inst 80: 269-275
    • (1988) J Natl Cancer Inst , vol.80 , pp. 269-275
    • Mukhopadhyay, T.1    Batsakis, J.G.2    Kuo, M.T.3
  • 34
    • 0025184879 scopus 로고
    • Use of the polymerase chain reaction in the quantitation of mdr-1 gene expression
    • Murphy LD, Herzog CE, Rudick JB, Fojo AT and Bates SE (1990) Use of the polymerase chain reaction in the quantitation of mdr-1 gene expression. Biochemistry 29: 10351-10356
    • (1990) Biochemistry , vol.29 , pp. 10351-10356
    • Murphy, L.D.1    Herzog, C.E.2    Rudick, J.B.3    Fojo, A.T.4    Bates, S.E.5
  • 35
    • 0025641727 scopus 로고
    • Stem cells: Attributes, cycles, spirals, pittalls and uncertainties. Lessons for and from the crypt
    • Potten CS and Loeffler M (1990) Stem cells: attributes, cycles, spirals, pittalls and uncertainties. Lessons for and from the crypt. Development 110: 1001-1020
    • (1990) Development , vol.110 , pp. 1001-1020
    • Potten, C.S.1    Loeffler, M.2
  • 36
    • 0021992491 scopus 로고
    • Development of fetal rat intestine in organ and monolayer culture
    • Quaroni A (1985) Development of fetal rat intestine in organ and monolayer culture. J Cell Biol 100: 1611-1622
    • (1985) J Cell Biol , vol.100 , pp. 1611-1622
    • Quaroni, A.1
  • 37
    • 0022475710 scopus 로고
    • Fetal characteristics of small intestinal crypt cells
    • Quaroni A (1986) Fetal characteristics of small intestinal crypt cells. Proc Natl Acad Sci USA 83: 1723-1727
    • (1986) Proc Natl Acad Sci USA , vol.83 , pp. 1723-1727
    • Quaroni, A.1
  • 38
    • 0019825888 scopus 로고
    • Cytotoxic effects and metabolism of benzo[a]pyrene and 7,12-dimethylbenz[a]anthracene in duodenal and ileal epithelial cell cultures
    • Quaroni A and Isselbacher KJ. (1981) Cytotoxic effects and metabolism of benzo[a]pyrene and 7,12-dimethylbenz[a]anthracene in duodenal and ileal epithelial cell cultures. J Natl Cancer Inst 67: 1353-1362
    • (1981) J Natl Cancer Inst , vol.67 , pp. 1353-1362
    • Quaroni, A.1    Isselbacher, K.J.2
  • 39
    • 0018394382 scopus 로고
    • Epithelioid cell cultures from rat small intestine. Characterization by morphologic and immunologic criteria
    • Quaroni A, Wands J, Trelstad RL and Isselbacher KJ (1979) Epithelioid cell cultures from rat small intestine. Characterization by morphologic and immunologic criteria. J Cell Biol 80: 248-265
    • (1979) J Cell Biol , vol.80 , pp. 248-265
    • Quaroni, A.1    Wands, J.2    Trelstad, R.L.3    Isselbacher, K.J.4
  • 40
    • 17744407622 scopus 로고
    • The primary structure of rat ribosomal protein L32
    • Rajchel A, Chan YL and Wool IG (1988) The primary structure of rat ribosomal protein L32. Nucleic Acids Res 16: 2347
    • (1988) Nucleic Acids Res , vol.16 , pp. 2347
    • Rajchel, A.1    Chan, Y.L.2    Wool, I.G.3
  • 41
    • 0028307550 scopus 로고
    • Phosphatidylcholine translocase: A physiological role for the mdr2 gene
    • Ruetz S and Gros P (1994) Phosphatidylcholine translocase: a physiological role for the mdr2 gene. Cell 77: 1071-1081
    • (1994) Cell , vol.77 , pp. 1071-1081
    • Ruetz, S.1    Gros, P.2
  • 43
    • 0029035652 scopus 로고
    • Characterization of the basal and carcinogen regulatory elements of the rat mdr1b promoter
    • Silverman JA and Hill BA (1995) Characterization of the basal and carcinogen regulatory elements of the rat mdr1b promoter. Mol Carcinog 13: 50-59
    • (1995) Mol Carcinog , vol.13 , pp. 50-59
    • Silverman, J.A.1    Hill, B.A.2
  • 44
    • 0025946645 scopus 로고
    • Cloning and characterization of a member of the rat multidrug resistance (mdr) gene family
    • Silverman JA, Raunio H, Gant TW and Thorgeirsson SS (1991) Cloning and characterization of a member of the rat multidrug resistance (mdr) gene family. Gene 106: 229-236
    • (1991) Gene , vol.106 , pp. 229-236
    • Silverman, J.A.1    Raunio, H.2    Gant, T.W.3    Thorgeirsson, S.S.4
  • 46
    • 0028875419 scopus 로고
    • Identification and characterization of a hepatoma cell-specific enhancer in the mouse multidrug resistance mdr1b promoter
    • Song R, Ikeguchi M, Zhou G and Kuo MT (1995) Identification and characterization of a hepatoma cell-specific enhancer in the mouse multidrug resistance mdr1b promoter. J Biol Chem 270: 25468-25474
    • (1995) J Biol Chem , vol.270 , pp. 25468-25474
    • Song, R.1    Ikeguchi, M.2    Zhou, G.3    Kuo, M.T.4
  • 47
    • 0028080881 scopus 로고
    • A homeodomain protein related to caudal regulates intestine-specific gene transcription
    • Suh E, Chen L, Taylor J and Traber PG (1994) A homeodomain protein related to caudal regulates intestine-specific gene transcription. Mol Cell Biol 14: 7340-7351
    • (1994) Mol Cell Biol , vol.14 , pp. 7340-7351
    • Suh, E.1    Chen, L.2    Taylor, J.3    Traber, P.G.4
  • 49
    • 0028722653 scopus 로고
    • Transcriptional regulation of multidrug resistance gene expression
    • Thorgeirsson SS, Grant TW and Silverman JA (1994) Transcriptional regulation of multidrug resistance gene expression. Cancer Treat Res 73: 57-68
    • (1994) Cancer Treat Res , vol.73 , pp. 57-68
    • Thorgeirsson, S.S.1    Grant, T.W.2    Silverman, J.A.3
  • 50
    • 0025551066 scopus 로고
    • Regulation of sucrase isomaltase gene expression along the crypt-villus axis of rat small intestine
    • Traber PG (1990) Regulation of sucrase isomaltase gene expression along the crypt-villus axis of rat small intestine. Biochem Biophys Res Commun 173: 765-773
    • (1990) Biochem Biophys Res Commun , vol.173 , pp. 765-773
    • Traber, P.G.1
  • 51
    • 0028408163 scopus 로고
    • Differentiation of intestinal epithelial cells: Lesions from the study of intestine-specific gene expression
    • Traber PG (1994) Differentiation of intestinal epithelial cells: lesions from the study of intestine-specific gene expression. J Lab Clin Med 123: 467-477
    • (1994) J Lab Clin Med , vol.123 , pp. 467-477
    • Traber, P.G.1
  • 52
    • 0025787393 scopus 로고
    • In vivo cell-specific expression of the cystic fibrosis transmembrane conductance regulator
    • Trezise AE and Buchwald M (1991) In vivo cell-specific expression of the cystic fibrosis transmembrane conductance regulator. Nature 353: 434-437
    • (1991) Nature , vol.353 , pp. 434-437
    • Trezise, A.E.1    Buchwald, M.2
  • 53
    • 0011349193 scopus 로고
    • Morphogenesis of the small intestine during fetal development
    • Trier JS and Moxey PC (1979) Morphogenesis of the small intestine during fetal development. Ciba Found Symp 3: 29
    • (1979) Ciba Found Symp , vol.3 , pp. 29
    • Trier, J.S.1    Moxey, P.C.2
  • 54
    • 0025247956 scopus 로고
    • The ontogeny of alpha-fetoprotein gene expression in the mouse gastrointestinal tract
    • Tyner AL, Godbout R, Compton RS and Tilghman SM (1990) The ontogeny of alpha-fetoprotein gene expression in the mouse gastrointestinal tract. J Cell Biol 110: 915-927
    • (1990) J Cell Biol , vol.110 , pp. 915-927
    • Tyner, A.L.1    Godbout, R.2    Compton, R.S.3    Tilghman, S.M.4
  • 55
  • 56
    • 0027407237 scopus 로고
    • Three distinct nuclear protein binding sites in the promoter of the murine multidrug resistance mdr1b gene
    • Yu LY, Cohen D, Piekarz RL and Horwitz SB (1993) Three distinct nuclear protein binding sites in the promoter of the murine multidrug resistance mdr1b gene. J Biol Chem 268: 7520-7526
    • (1993) J Biol Chem , vol.268 , pp. 7520-7526
    • Yu, L.Y.1    Cohen, D.2    Piekarz, R.L.3    Horwitz, S.B.4
  • 57
    • 0027156574 scopus 로고
    • Structural and functional analysis of 5′ flanking and intron 1 sequences of the hamster P glycoprotein pgp1 and pgp2 genes
    • Zastawny RL and Ling V (1993) Structural and functional analysis of 5′ flanking and intron 1 sequences of the hamster P glycoprotein pgp1 and pgp2 genes. Biochim Biophys Acta 1173: 303-313
    • (1993) Biochim Biophys Acta , vol.1173 , pp. 303-313
    • Zastawny, R.L.1    Ling, V.2


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