Seminiferous tubule differentiation was related to the occurrence of germ cell neoplasia in 38 men. aged 17-47. treated surgically in childhood for cryptorchidism. Tissues from 46 testes obtained from biopsies taken as a neoplastic preventive procedure or whole testes removed because of GCT were evaluated quantitatively. https://www.secondgearwncers.shop/product-category/knives/