Galactose (/ɡəˈlæktoʊs/, galacto- + -ose, "milk sugar"), sometimes abbreviated Gal, is a [[monosaccharide]] sugar that is about as sweet as glucose, and about 65% as sweet as [[sucrose]].
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It is an aldohexose and a C-4 epimer of glucose.
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A galactose molecule linked with a glucose molecule forms a lactose molecule.