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Contact inhibition of overlapping: One of the factors involved in deep cell epiboly of Nothobranchius korthausae

Developmental Biology, ISSN: 0012-1606, Vol: 70, Issue: 1, Page: 171-179
1979
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Article Description

Living eggs of the annual fish Nothobranchius korthausae were studied during epiboly either by direct observation or with time-lapse cinematography. Before epiboly the deep cells are tightly packed on top of each other between the enveloping cell layer and the periblast and they are stationary. From stage 17a (half-epiboly) to stage 21, deep cells build up a monolayer of moving and colliding cells. In the course of epiboly all the deep cells acquire the ability to show contact inhibition of overlapping. This was demonstrated directly by recording the outcomes of many cellular collisions. Neither cellular overlapping nor nuclear overlapping was observed. The dispersion of the deep cells during epiboly over the yolk is due both to contact inhibition and to the fact that the deep cells are attached to the undersurface of the spreading enveloping cell layer.

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