The Q allele variant (GLN121) of membrane glycoprotein PC‐1 interacts with insulin receptor and inhibits insulin signaling more effectively than the common K allele variant (LYS121). - Constanzo,B.V.; Trischitta,V.; Di Paola,R.; Spampinato,D.; Pizzuti,A.; Vigneri,R.; Frittitta,L. (Diabetes, 2001)