Definition: the protoplasmic boundary of all cells that controls permeability and may serve other functions through surface specializations, active ion transport absorption by formation of pinocytotic vesicles or receptor-mediated antigen recognition; its fine structure is trilaminar and consists of the electron-dense lamina externa and lamina interna with an electron-lucent lamina intermedia.
Synonym(s): cytolemma, cytomembrane, plasma membrane, plasmalemma, plasmolemma, Wachendorf membrane2
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