Figure 1.

Histological appearance of donor and grafted testis tissue. A, Three-month-old donor tissue. B, Six-month-old donor tissue. C, Graft from 3-month-old donor recovered from untreated mouse. D, Graft from 6-month-old donor recovered from untreated mouse. E, Graft from 3-month-old donor recovered from gonadotropin-treated mouse. F, Graft from 6-month-old donor recovered from gonadotropin-treated mouse. Arrows indicate spermatogonia in A–D, pachytene spermatocytes in E, and spermatids in F. Hematoxylin and eosin staining. Bar, 50 μm.