Immunogen sequence: PSLPHEVSTL ISRPHPTVGE SLASIPQPVT AVPGTGLQAG GRSTVPQRVT LFRQMSSGAI PPNRGVPPAP PPPAAALPRE SSSVLNTDPD AE Highest antigen sequence identity to the following orthologs: Mouse - 91%, Rat - 87%. HCN1 includes Hyperpolarization-activated cati