Polyploidy and polyteny in the trophoblast cells of the mink
Zybina, E.V.; Zybina, T.G.; Isakova, G.K.; Kiknadze, I.I.; Shteĭn, G.I.
Tsitologiia 34(11-12): 55-59
1992
ISSN/ISBN: 0041-3771 PMID: 1302394 Document Number: 399680
According to cytophotometry, trophoblast cells in the mink placenta are both diploid and polyploid, the ploidy level ranging from 2c to 64c. A great number of mink trophoblast cells were seen to divide mitotically. In addition to the ordinary mitotic figures, polyploid mitoses as well as abnormal mitotic figures were observed. Non-classic polytene chromosomes, peculiar to the mammalian trophoblast, appeared in the mink trophoblast cells to have the highest ploidy. A relatively low ploidy degree is due, probably, to a lesser invasive activity of the mink trophoblast cells as compared to the rodent giant trophoblast cells.