Positive Samples: Mouse brain Immunogen sequence: GVAAPPVPPP PPTPFPQAKA RRKGRRGGKC STRCFCPRPH AKAFACPVES CVRSFARSDE LNRHLRIHTG HKPFQCRICL RNFSRSDHLT THVRTHTGEK PFACDVCGRR FARSDEKKRH SKVHLKQKAR AEERLKGLGF YSLGLSFASL. Early growth response protein 4 (EGR-4