Fig. 7. Frequencies of seminiferous tubules at indicated stages and of apoptotic
tubules (red bar) in B6 (white bars) and Rb/+ (black bars) adult mice.
Sectioned material was staged with Periodic Acid-Schiff reagent and
Hematoxylin, and processed using the TUNEL method for detecting apoptotic
cells. All stage XII tubules in Rb/+ mice were apoptotic (red). Asterisks
represent paired values that differ significantly (Student's t test;
P=0.035 for difference in frequency of stage VII-IX tubules and
P=0.033 for difference in frequency of stage XII tubules).
