Immunogen sequence: LSIFQSHCHY YLQERSKGQP SERTAPGLRN TSGIDSPWKK TGKNRKLKSK RVKPRDSSES TGSGGPVSAR PPLVGLNATA WSPSDTSQSS CPA. PER2, also known as Period circadian protein homolog 2, is a mainly nuclear protein that shows nucleocytoplasmic shuttling which i