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Reference.org
Apical constriction
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<p>In <a href="/facts/Morphogenesis/zHJh8Eae">morphogenesis</a>, apical constriction is the process in which contraction of the <a href="/facts/Apical_(cell_biology)/vAXSD0DT">apical</a> side of a <a href="/facts/Cell_(biology)/bLM9UQvy">cell</a> causes the cell to take on a wedged shape. Generally, this shape change is coordinated across many cells of an <a href="/facts/Epithelial/ecKHcHC3">epithelial</a> layer, generating forces that can bend or fold the cell sheet. </p>