Figure 3
From: Understanding spermatogenesis is a prerequisite for treatment
![Figure 3](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1477-7827-1-107/MediaObjects/12958_2003_Article_107_Fig3_HTML.jpg)
(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