The chemical group or radical that remains when you remove one hydrogen atom from a sugar molecule, used in building larger sugar-containing compounds.
From 'glyco-' (sugar) + '-syl' (chemical radical suffix). This term emerged in organic chemistry to describe the reactive form of sugars used in synthesis of complex molecules.
Glycosyl groups are like the 'connectors' in sugar-based molecules—when cells build proteins or lipids with sugar attachments, they're essentially gluing glycosyl groups onto these larger structures.
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