Dev Growth Differ 1979 Jan 01;211:39-46. doi: 10.1111/j.1440-169X.1979.00039.x.

CELL CONTACT REFORMATION OF DISSOCIATED CELLS FROM EMBRYONIC CELLS OF STRONGYLOCENTROTUS PURPURATUS.

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Disaggregated single cells from the gastrula of Strongylocentrotus purpuratus were studied as they reaggregated and reformed quasi-normal embryos. In this investigation emphasis was placed on the structural events involved during the reformation of cell contacts vis-a-vis cell migration. The early cell contacts are non-junctional cell appositions, which are characterized by non-parallel apposing membranes. Between post-migratory epithelial cells, there is a shift from non-parallel to parallel apposing membranes. These cell appositions are found between the overlapping lamellapodia along the apical margins of the epithelial cells during blastocoel enlargement. Incipient continuous junctions are formed by the deposition of an electron dense material in the intermembrane space. As the junction develops, electron dense plaques form in the cytoplasm immediately subjacent to the junction and septa form between the apposing membranes.

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