NCIt definition : An enzyme that catalyzes the transfer of glycosyl groups to an acceptor. The acceptor
molecules are frequently carbohydrate molecules, or inorganic phosphates. A special
subsect of glycosyltransferases can also catalyze hydrolysis. Subclasses include Hexosyltransferases,
Pentosyltransferases and Sialyltransferases. 2005;