Immunogen sequence: VIVEAFKHVS SETDESCKKH LGRVLSIWEE RSVYENDVLE QLKQALYGDK KPRKRTYEQI KVDENENCSS LGSPSEPPQT L Highest antigen sequence identity to the following orthologs: Mouse - 98%, Rat - 98%. P15RS is upregulated in cells overexpressing cyclin-depend