A human salivary glycoprotein which exhibits blood‐group substance activity in the ABO and Lewis systems, and which also inhibits the haemagglutinins of influenza virus ( Rølla &Jonsen 1968) has been analysed. Glycoprotein preparations from a non‐secretor (O, Le a+b ‐ ) and from a secretor (O, Le a ‐ b+) showed very similar amino acid composition, indicating identical protein cores in the two glycoproteins, whereas the secretor preparation contained more amino sugars and fucose. The salivary blood‐group active glycoproteins had an amino acid composition different from the ovarian cyst blood‐group substances and contained more protein than these preparations.
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Sönju et al. (1971) studied this question.
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