Collagen-Binding Proteins in Sea Urchin Eggs and Embryos
Gastrulation is the first important event of morphogenesis in the sea urchin embryo. Near the end of the blastula stage, certain cells in the vegetal plate lose adhesivity to each other and to the hyaline layer and migrate from the blastula wall into the blastocoelic cavity giving rise to the primary mesenchyme cells. Following migration of the primary mesenchyme cells, the cells remaining in the vegetal plate begin to invaginate into the blastocoel to form the archenteron. The tip of the archenteron advances towards the animal pole and touches the ectodermal wall to open the stomodeum. The process of gastrulation seems to be controlled by the ability of cells to adhere to other cells and to substrates.
KeywordsGastrula Stage Blastula Stage Early Gastrula Spicule Formation Hyaline Layer
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