Figure 3
From: Understanding spermatogenesis is a prerequisite for treatment
(A) The storage of lipid droplets of different size and composition in the Sertoli cells correlates to the age of the man. The Sertoli cell represent a "biological clock" of the testis. (B) Seminiferous tubule with marked clones of germ cells. Drawing on the basis of a semithin section. × 300