Abstract
Carcinoembryonic antigen (CEA) and a related glycoprotein, CCEA-2, have been extracted from human metastatic colonic carcinomas and separated by gel filtration. The amino acid compositions of CEA samples prepared from different colonic carcinomas are very similar, but differ from that of partially purified CCEA-2. CCEA-2 also differs from CEA in having a much lowe mol. wt and a higher protein content. CEA shows charge heterogeneity which is not due to variation in its overall amino acid composition and which may therefore be due to variation in sialic acid content. CEA purified by gel filtration is free from CCEA-2.
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