slot-blot analyses from 1-mm segments of seminiferous tubules and in situ hybridization from testis sections showed that the levels of mrna for tp1 increased in step-7 round spermatids at substage viib of the seminiferous epithelial cycle , earlier than that of p1 and p2 at substage viic .
C0036630
seminiferous tubules
C0039597
testis