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Two groups of human IgM proteins are described. One group interacts with a heat-labile component of rabbit or human serum which has characteristics similar to C′1q. The second group fails to interact with this factor. This grouping is not related to κ or λ chains or to previously described differences in human IgM molecules. Such a division may provide a tool for the identification of µ chain genetic markers.
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MacKenzie et al. (1969) studied this question.
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