Cloning and expression of a cDNA coding for the human platelet-derived growth factor receptor: evidence for more than one receptor class - Gronwald, R GK; Grant, F J; Haldeman, B A; O’Hara, P J; Hagen, F S; Ross, R; Bowen-Pope, D F; Murry, M J (Proc Natl Acad Sci USA, 1988)