The ligand specificities of the insulin receptor and the insulin-like growth factor I receptor reside in different regions of a common binding site. - Kjeldsen,T.; Andersen,A.S.; Wiberg,F.C.; Rasmussen,J.S.; Schaffer,L.; Balschmidt,P.; Moller,K.B.; Moller,N.P. (Proc Natl Acad Sci USA, 1991)