The FUT2 secretor variant p.Trp154Ter influences serum vitamin B12 concentration via holo-haptocorrin, but not holo-transcobalamin, and is associated with haptocorrin glycosylation. - Velkova A; Diaz JEL; Pangilinan F; Molloy AM; Mills JL; Shane B; Sanchez E; Cunningham C; McNulty H; Cropp CD; Bailey-Wilson JE; Wilson AF; et al. (Human molecular genetics, 2017)