Heterogeneity of Human Serum Beta-lipoprotein

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Abstract
Human serum beta-lipoprotein (specific gravity 1.063 to 1.007) has previously been shown to form two lines on immunoelectrophoresis. In the study of a large number of individual sera it appears that both are not always present, that they are present in varying amounts in normal individuals, that a third form sometimes exists, that they are not separable by sedimentation techniques, and that they cross-react immunologically. These can also be demonstrated on starch gels and starch gel immunoelectrophoresis, one form entering the gel and the other remaining at the origin.