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A cell-cell contact zone that consists of membrane invaginations extending from either cell, which contain tight-, gap-, and adherens junctions. Peg and socket contacts form between endothelial cells and pericytes, and between lens fiber cells. [GOC:tfm, NIF_Subcellular:sao1943947957, PMID:12883993, PMID:16166562, PMID:17591898]
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