Immunogen sequence: ELAKQLADTM VLPIIQFREK DLTEVSTLKD LFGLASNEHD LSMAKYSRLP KKKENEKVKT EVGKEVAAAR RKQHLSSLQY YCALNALQYR KQMA Antigen sequence identity: Mouse 93%; Rat 93%. Required for the regulation of cell proliferation in response to extracellular sign