A glycoprotein possessing blood‐group and virus haemagglutination inhibition activity was isolated from the saliva of donors of blood groups A and B. The glycoprotein was subjected to amino acid analysis and tested for alkali stability and the presence of sulphate. No definite differences in‐the amino acid composition between the blood groups A and B could be found. The salivary glycoprotein was alkali stable and contained a substantial amount of sulphate. The results were compared with reported properties of blood‐group substances obtained from erythrocytes and ovarian cyst material.
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Sonju et al. (1975) studied this question.
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