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Testes were fixed in Bouin or 4% paraformialdehyde, processed in paraffin, sectioned, and stained with hematoxylin/eosin solution. Monoclonal antibodies to EE2 (1:200) and GATA-1 (1:50) (Santa Cruz, Santa Cruz, CA) were incubated on deparaffinized sections overnight and detected by indirect biotin-streptavidin-peroxidase (BSP) labeling (Vector, Burlingame, CA). Species-crossreactive rabbit polyclonal antibodies to GDNF (1:500; Santa Cruz), c-Kit (1:200; Santa Cruz), and c-Ret (1:500; IBL, Fujioka, Japan) were incubated for 48 hours at 4°C and detected with BSP Labeling.
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0343283910
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Web figs. 1 through 5 are available at Science Online at www.sciencemag.org/features/data/1046816/shl.
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32P]dCTP. All probes were the same as in the in situ hybridization, except that the c-Ret probe was a 3.3-kb full-length cDNA. Testes were homogenized in lysis buffer containing 1M NaCl and immuno-precipitated with species-crossreactive human recombinant GDNF antibody (R&D Systems, Minneapolis, MN). After 20% SDS-polyacrylamide gel electrophoresis, Western blotting was done on Hybond ECL membranes (Amersham). GDNF was detected with rabbit polyclonal antibody to human GDNF (Santa Cruz), followed by horseradish peroxidase-conjugated antibody (Sigma) and ECL chemiluminescence (Amersham).
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0343283906
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note
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The mice were injected intraperitoneally (ip) with BrdU (Amersham). After 2 hours, testes were dissected, fixed in Bouin, and processed in paraffin. BrdU incorporation was detected by monoclonal BrdU antibody (Amersham) and indirect immunofluorescence [tetramethyl rhodamine isothiocyanate (TRITC) -antibody to mouse immunoglobulin G (IgG), 1:100; Jackson Immunoresearch] or BSP labeling. Apoptotic cells were detected with the ApopTag kit (Intergen, Purchase, NY).
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0343283905
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note
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Electron microscopic biopsies were processed by standard methods and examined with a JEM 1200EX microscope (JEOL, Tokyo, Japan).
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Wild-type and transgenic mice at 3 weeks of age (n = 9 mice in both groups) were injected ip with all-trans retinol (Sigma) (10 mg per kg of body weight per day). Testes were processed for histology after 3 or 8 days.
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0343719421
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note
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We thank A. Hanninen, K. Westerdahl, and P. Leikas-Lazanyi. K. Wartiovaara (University of Helsinki) cloned human GDNF cDNA. EE2 antibody was from Y. Nishimune (Osaka University, Japan). Supported by the Sigrid Jusélius Foundation, Technology Advancement Center of Finland (TEKES), the Academy of Finland, and EUBioMedII (contract BMH 4-CT97-2157).
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