Galactose (from Greek γάλακτος galaktos "milk"), sometimes abbreviated Gal, is a monosaccharide sugar that is less sweet than glucose. It is a C-4 epimer of glucose.
Galactan is a polymer of the sugar galactose found in hemicellulose. Galactan can be converted to galactose by hydrolysis.
Read more about Galactose: Structure and Isomerism, Relationship To Lactose, Metabolism, Sources, Clinical Significance