Conserved residues Arg188 and Asp302 are critical for active site organization and catalysis in human ABO(H) blood group A and B glycosyltransferases. - Gagnon SML; Legg MSG; Polakowski R; Letts JA; Persson M; Lin S; Zheng RB; Rempel B; Schuman B; Haji-Ghassemi O; Borisova SN; Palcic MM; et al. (Glycobiology, 2018)