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Activation does not affect endogenous levels of superficial zone protein (SZP) in platelet-rich plasma (PRP). Whole blood samples were collected from 7 healthy donors. Endogenous SZP concentration of nonactivated and activated PRP was quantified using enzyme-linked immunosorbent assay. The SZP content of PRP was not influenced by the 2 activation methods employed (P = .927). Values are presented as the mean + SD for 7 samples per group. ns, not significant.
