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Molecular weight protein markers (a), fetal bovine serum (FBS, b), platelet releasate (PR, c), and heat-treated PR (HPR, d). Patterns show the absence of fibrinogen (about 260 kDa) in FBS, PR, and HPR, higher contents of immunoglobulin G (160 kDa) in the PR and HPR, and the presence of albumin (58 kDa) as the main protein component in FBS, PR, and HPR.
