@-Lactoglobulins A, B, and C have been isolated, purified, and examined for amino acid composition, The previously described difference between @-A and P-B in content of aspartic acid, glycine, valine, and alanine is confirmed, and @-C is found to differ from P-B only in content of glutamine and histidine. P-Lactoglobulin C has 2 residues more of histidine and 2 residues fewer of glutamine than P-B per molecule of -36,000 molecular weight. DEAE-cellulose column chromatography, using a phosphate buffer containing a NaCl gradient, has been extended to provide a separa-
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