Precipitins in nine sera from normal Liberian adults were shown to react with an alpha-globulin in goat and sheep sera. No cross-reaction was demonstrated with bovine sera. Hence these precipitins are different to others previously described. At present their significance, if any, is unknown. They are important as a possible cause of unexplained reactions in serological tests using sheep or goat serum as a source of antigen or antibody.
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