Immunogen sequence: SMKRIELDDS ISASSSSQGL SQPSTQTTQY LRADTPNNAT PITSSLGYPT LRIEKNDLRS VTLLEAKGKV KDIAISRERI TLKDVLQEGT FGRIFHGILI DEKDPNKEKQ AFVKTVKDQA SEIQVTMMLT ESCKLRGLHH RNLLPITH. RYK is an atypical member of the family of growth factor receptor prot