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Biosynthesis of the three globo-series GSLs SSEA3, SSEA4, and GH that are exclusively expressed on at least 15 different types of cancer and their stem cells. The galactosyltransferase β3GalT5 is the key enzyme involved in the synthesis of globo-series GLSs, and its expression highly correlates with poor survival of cancer patients. Symbol nomenclature with color code is used for structure presentation. The complete structure of GH is shown.
