Premeiosis and premeiotic DNA synthesis in the left ovary of the female chick embryo

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Abstract
Cytological changes occurring during premeiosis in the germ cells of the ovarian cortex of the chick embryo were studied by means of Feulgen staining (specific for DNA). The evolution of the preleptotene stages of the germ cells after 3H-thymidine pulses was investigated by the combination of pre- and post-autoradiographic observations and photographs. The germ cells in premeiotic S phase present a particular structure, different from the structure found in germ cells during premitotic S phase. They are the direct precursors of the meiocytes in leptotene stage.

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