Asparagine (N)-glycosylation is an essential modification that regulates protein folding and stability. ALG13 and ALG14 (MIM 612866) constitute the UDP-GlcNAc transferase, which catalyzes a key step in endoplasmic reticulum N-linked glycosylation (Averbeck et al., 2007 [PubMed 17686769]).[supplied by OMIM, Jun 2009]