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By absorbing a number of anti-human blood immune sera from rabbits with the blood corpuscles of certain individuals regardless of the group, fluids were obtained from a few sera which give a Among 116 individuals selected from the four blood groups the distribution of the agglutinable factor (which may be designated as M) was as shown in Table II. This reaction is distinguished by its intensity from some others known to show individual differences within the groups, such as the reactions with cold agglutinins.
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Landsteiner et al. (1927) studied this question.
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