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Semi-thin sections of prepubertal cryptorchid testes. (A) Low infertility risk (LIR/Ad+) testes and (B) high infertility risk (HIR/Ad−) testes. Atrophic Leydig cells (LC) and a severe reduction of germ cells is a typical picture in cryptorchid boys with defective mini-puberty (Ad− group). Dark type (Ad) spermatogonia, juvenile LC and germ cells (Sp) are indicated with arrow heads.
