Fig. 2.

Diagram of the spermatogenesis process in Sturnira lilium, with the mean frequency (%) and the duration in days of each one of the eight stages of the seminiferous epithelium cycle. Each line corresponds to a generation of spermatogenic cells and each column corresponds to one stage. The Roman numerals indicate the spermatogenic cycles. A, type A spermatogonia; I, intermediate spermatogonia; B, type B spermatogonia; PL-L, primary spermatocyte, in preleptotene to leptotene; Z, in zygotene; P, in pachytene; D, in diplotene; S, secondary spermatocyte; Rs, round spermatid; Es, elongated spermatid. The labeled germinative cell, which was more advanced (arrow) at the eight stages of the cycle, 1 day after treatment with bromodeoxiuridine, was the primary spermatocyte in leptotene to zygotene, at stage 2.