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• W2346608934 abstract "Two problems are raised concerning the movement of cells during tissue-specific sorting-out of chick embryo cells in mixed aggregates. (i) A possible expectation from the hypothesis of 'contact inhibition' is that cells which are entirely surrounded by other cells in monolayer should be held stationary. Cells within solid aggregates, being totally surrounded by others, might also not be expected to move. How is it then that cell movement takes place within solid aggregates during sorting-out? (ii) Are the movements of cells within sorting aggregates 'passive', being driven by adhesive differentials or 'active', being merely guided by such differentials? In order to study these questions, sorting out experiments with chick embryonic limb bud mesenchyme and liver cells were carried out in monolayer culture, permitting direct observation of cell movements. Cell behavior was observed by time-lapse cinematography. Sorting-out of these cells in monolayer began before and continued after the cells had spread to confluency. During sorting, liver cells showed ruffing activity even when they appeared to be totally surrounded by other cells. Both cell types showed contact inhibition as judged by the criterion of monolayering, for they did not move over each other but remained attached to the substratum. Yet the cells in the confluent monolayer were not immobilized. Because of this, we suggest that the observed restraint against overlapping did not result from an inhibition of movement. Several considerations, detailed in the text, suggest that cell movement during sorting-out involve active locomotion. Previous work suggest that sorting-out configurations are determined by the relative intensities of intercellular adhesive strengths, the more cohesive of 2 cell populations tending to adopt the internal position. While limb bud cells form internal islands surrounded by liver cells in solid aggregates, the reverse was found to be the case in these monolayers. This suggests that, in the monolayer, limb bud cohesiveness is depressed relative to liver cell cohesiveness. This is consistent with the observation that the limb bud cells flattened themselves markedly against the substratum, significantly decreasing their area of mutual apposition." @default.
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• W2346608934 date "1975-08-01" @default.
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• W2346608934 title "Observations on the sorting-out of embryonic cells in monolayer culture" @default.
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• W2346608934 doi "https://doi.org/10.1242/jcs.18.3.385" @default.
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