Letter to the Editor

Abstract
The membrane protein composition of pig, cow and calf platelets was investigated followed by their characterization on polyacrylamide gels. Qualitative and quantitative differences among protein composition of mammalian platelet membranes were found. In all the investigated animals, the protein of 44,000 daltons made up about 25% of total membrane proteins. Among the major protein components of platelet membranes, there were glycoproteins II and III as well. Platelet membranes of young and old animals of the same species, e.g., cow and calf, were composed of almost the same molecular weight classes of proteins.

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