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Stages of the seminiferous epithelial cycle in the Yangzhou goose ganders. Roman numerals indicate the stages of the cycle, whereas Arabic numerals indicate the steps of spermatids development (1–10). Ad (dark type spermatogonia), Ap1 (pale type spermatogonia), Ap2 (pale type spermatogonia), B type B spermatogonia, L (leptotene primary spermatocytes), P (pachytene primary spermatocytes) and D (diplotene primary spermatocytes). Scale bar = 1 µm.
