after 4 months of treatment of adult male dogs with the gnrh agonist ( gnrh-a ) [ d-trp6 ] gnrh ethylamide , the seminiferous tubules contained only type a and b spermatogonia , sertoli cells , and rare primary spermatocytes , thus causing a 64 % decrease in testis weight .
C0036630
seminiferous tubules
C0037866
spermatogonia