Background-The exposure of phosphatidylserine occurs during platelet activation and during in vitro storage. Phosphatidylserine exposure also occurs during apoptosis following the release of mitochondrial cytochrome c. We have examined the role of cytochrome c release, mitochondrial membrane potential (ΔΨm), and cyclophilin D (CypD) in phosphatidylserine exposure due to activation and storage.
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