FIG. 1.

HE staining of testicular cross sections of collected specimens. For each animal studied in the paper (n = 10 mice, n = 3 dogs, n = 4 rats, n = 2 guinea pigs, n = 1 mini pig) we processed testis fragments for histology and for FACS. Here we present representative HE staining from each species. In each subject, histological examination of testicular cross sections shows the presence of all germ cell types in different developmental stages at lower (left panel) or higher (right panel) magnification, confirming that the specimens were sexually mature and presented a normal testicular phenotype.