Developmental Changes in Glycogen Content of Primordial Germ Cells in Chick Embryo.

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Abstract
Summary Glycogen containing tissue PGCs on the 2nd day of incubation appeared first in the splanchnic mesoderm posterior to the omphalomesenteric arteries. These cells originated from smaller circulating PGCs which contained less glycogen. The PGCs moved out of the capillaries, enlarging and accumulating glycogen as they did so, and migrated to the gonadal site. As these cells became located in the developing gonad they lost their glycogen. This loss of glycogen became evident on the 4th day, was marked on the 5th and by the 7th the majority were without glycogen.

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