Abstract
The transbilayer movement of aminophospholipids in the plasma membrane of ram sperm cells was investigated using spin-labeled lipid analogues. After incorporation, spinlabeled phosphatidylserine (SL-PS) and phosphatidyl-ethanolamine (SL-PE) rapidly disappeared from the exoplasmic monolayer. Even at lower temperatures (10 degrees C) the inward movement of SL-PE is fast. The initial velocities of the internalization of SL-PS and SL-PE were compared with those of ram and human erythrocytes.
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