The isolation of transferrin from rat serum by means of affinity chromatography on CNBr-activated Sepharose 4 B is described. -2. Subfractionation by isoelectric focusing yielded two transferrin fractions with identical biological behaviour but with small differences in isoelectric point (6.0 and 5.8) and sialic acid contents.
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Eijk et al. (1976) studied this question.