Immunogen sequence: TSTMPNSSQS SHSSSGTLSS LETVSTQELY SIPEDQEPED QEPEEPTPAP WARLWALQDG FANLECVNDN YWFGRDKSCE YCFDEPLLKR TDKYRTYSKK HFRIFREVGP KNSYIAYIED HSGNG. CHEK2 (CHK2) is a serine/threonine kinase and a component of the DNA damage checkpoint pathway.