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A monoclonal antibody with anti-sialyl-lacto-N-fucopentaose II specificity, originally thought to be a specific tumor marker in pancreas- and gastrointestinal tumors, reacts strongly with fucose-rich glycoproteins from human seminal plasma obtained by phenol/saline extraction. They are presumed to come from the prostatic gland secretion. Because of the specificity of this monoclonal antibody it can be deduced that the sialyl-Lea-sequence: N-acetyl-alpha-neuraminyl-(2----3)-beta-D-galactopyranosyl-(1--- -3)-[alpha-L-fucopyranosyl-(1----4)]-2-acetamido-2-deoxy-beta-D-gluco pyranosyl-(1----3)-D-galactopyranosyl is present on these glycoproteins. This is also supported by our carbohydrate analysis.

Unexpected Occurrence of the Ca 19-9 Tumor Marker in Normal Human Seminal Plasma