Fig. 1. Expression pattern of BMP4, Alk3 and BMPIIR in the testicular cell types. (A) Northern blot analyses of BMP4 expression in Sertoli cells obtained at different ages of postnatal development (upper panel), compared to ethidium bromide staining of the same gel (bottom panel). (B) Northern blot analyses of BMP4 (upper panel) and Alk3 (middle panel) expression in different cell types from testis at different ages of development (sptogonia=spermatogonia at 4 and 7 dpn; sptocytes=spermatocytes at 60 dpn; sptids=spermatids at 60 dpn), compared to actin expression (lower panel). (C) Northern blot analyses of BMPIIR expression (upper panel) within the different cell types of the testis, compared to actin expression (lower panel).