Catalysis of the reaction: UDP-D-galactose + a glucosylceramide = a lactosylceramide + uridine-5'-diphosphate. The glucosylceramide has sphinganine as the long chain base.
Catalysis of the reaction: UDP-D-galactose + a glucosylceramide = a lactosylceramide + uridine-5'-diphosphate. The glucosylceramide has sphinganine as the long chain base. (en)