Positive Samples: SH-SY5Y, Mouse brain, Rat brain Immunogen sequence: KLKKKKNEKE DKRPRTAFTA EQLQRLKAEF QANRYITEQR RQTLAQELSL NESQIKIWFQ NKRAKIKKAT GIKNGLALHL MAQGLYNHST TTVQDKDESE. EN1 (Engrailed homolog 1) is a transcription factor expressed in embryoni