Immunogen sequence: PGGSPRRVIV QASTGELLRC LGDFVCRRCY RLKELSPGEL VGWFRGVDRS LLLQGWQDQA FITPANLVFV YLLCRESLRG DELASAAELQ AAFLTCLYLA YSYMGNEISY PLKPFLVEPD KERFWQRCLR LIQRLSPQML R. The protein encoded by this gene is a neuron-specific activator of CDK5 kinas