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implications, from cell shape determination to critical signaling processes like blood coagulation and apoptosis. Many cells maintain asymmetric distributions of phospholipids between their cytoplasmic and exoplasmic membrane leaflets. The loss of asymmetry, in particular the appearance of the anionic phospholipid phosphatidylserine on the exoplasmic face, can serve as an early indicator of apoptosis and as a signal for efferocytosis.

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