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  Indian J Med Microbiol
 

Figure 1: Classification of the XIV different stages of the seminiferous epithelium cycle characterized in the rat. The vertical columns, designated by roman numerals, depict the cell associations. The letters designate specific germ cell types: type A (A1– A4), intermediate (In) and type B (B) spermatogonia; preleptotene (Pl), leptotene (L), zygotene (Z), pachytene (P), and diplotene (Di) primary spermatocytes and secondary spermatocytes (II). Mitotic divisions (M). The Arabic numbers (1– 19) designate the steps of spermiogenesis (Modified from Dym and Clermont40).

Figure 1: Classification of the XIV different stages of the seminiferous epithelium cycle characterized in the rat. The vertical columns, designated by roman numerals, depict the cell associations. The letters designate specific germ cell types: type A (A<sub>1</sub>– A<sub>4</sub>), intermediate (In) and type B (B) spermatogonia; preleptotene (Pl), leptotene (L), zygotene (Z), pachytene (P), and diplotene (Di) primary spermatocytes and secondary spermatocytes (II). Mitotic divisions (M). The Arabic numbers (1– 19) designate the steps of spermiogenesis (Modified from Dym and Clermont<sup>40</sup>).