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Fig. 3. BMP4 induces [3H]thymidine incorporation in postnatal spermatogonia. Proliferative response to BMP4 and Kitl in 4 and 7 dpn isolated spermatogonia. Mean of the fold increase of [3H]thymidine incorporating cells for at least four independent experiments. Bars represent the standard deviation. Asterisks indicate the presence of statistical significance (P<0.001).