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A new antibody, named anti‐Lu4, has been discovered, that reacts with a high frequency red cell antigen. The antibody does not react with dominant or recessive Lu(a‐b‐) red cells or with the red cells of the propositus and two of her five siblings. Because the propositus and her sibs are all Lu(a‐b+), anti‐Lu4 cannot be the same as anti‐LuaLub. Attempts to identify a low frequency allele to Lu4 were unsuccessful. The results suggest that Lua, Lub and Lu4 have a common precursor.
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Bove et al. (1971) studied this question.
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