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Molecular weight distribution of species observed in acetonitrile supernatant. cLC-MS was used to analyze 49 serum specimens after acetonitrile precipitation. A: This histogram shows the distribution of all molecular species ranging from 500 to 5000 Da. B: This histogram shows the distribution of all molecular species ranging from 5 to 10 kDa. The majority of the species present were below 2000 Da.
