Immunogen sequence: NTPEEKDLKD RMAHAMNEYP DSCAVLVRRH GVYVWGETWE KAKTMCECYD YLFDIAVSMK KVGLDPSQLP VGENGIV. The mammalian homologues of the key cell death gene CED-4 in C. elegans has been identified recently from human and mouse and designated Apaf 1 (for