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Hollow-fiber flow field-flow fractionation is here applied to untreated, whole human blood serum. Matrix-assisted, laser desorption/ionization time-of-flight-mass spectrometry (MALDI-TOF-MS) of serum fractions shows mass signals in the <30000M r range where low-abundance, serum protein components are known to be present, though a membrane of nominal 30000Da cutoff was employed for the fractionation...
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