Galactosemia is a rare genetic metabolic disorder that affects an individual's ability to metabolize the sugar galactose properly. Galactosemia appeared in several abstracts from the O-linked Glycosylation Disorders (OGD) set as well as the Congenital Disorders of Glycosylation (CDG) set and was marked frequently by Mark2Curators. Studying galactosemia has yielded insights on glycosylation and the literature on galactosemia may hold clues for understanding NGLY1. Help mark this small set of abstracts and expand on the knowledge networks previously generated by Mark2Cure contributors. Note- a previous description for this set stated that galactosemia was marked in the Oxidative Stress (OST) set. This was in error due a mix-up between the group numbers and their names.