Richardson, Brian, Richard Smith, Daniel Ungar, Ayumi Nakamura, Philip Jeffrey, Vladimir Lupashin, and Frederick Hughson. (2009) 2009. “Structural Basis for a Human Glycosylation Disorder Caused by Mutation of the COG4 Gene.”. Proc Natl Acad Sci U S A 106 (32): 13329-34. doi:10.1073/pnas.0901966106.