[DNA content of the nuclei of secondary giant cells of the rat trophoblast at different phases of the polytene nucleus cycle].

A cytophotometric study of DNA content has been made for secondary trophoblastic giant cells, which differ morphologically in relation to the stage of the cycle of the polytene nucleus. The ploidy rate varying from 16c to 512c. It is shown that the DNA content of the nuclei with polytene chromosomes in phase G is more stable, corresponding to the 2c multiple DNA content. Unlike, reticular nuclei in phase S do not present clear-cut peaks on a histogram of DNA. Ratios of nuclei with unequal ploidy differ depending on the structure of these nuclei.