Immunogen sequence: CAALVKAGKV YAAATEDMDC LTFGSPVLMR HLTASEAKKL PIQEFHLSRI LQELGLNQEQ FVDLCILLGS DYCESIRGIG PKRAVDLIQK HKSIEEIVRR LDPNKYPVPE NWLHKEAHQL FLEPEVLDPE SVELKW. FEN-1 (Flap Endonuclease and Five prime Exonuclease) is a 42 a protein that functio