A highly conserved proapoptotic gene, IKIP, located next to the APAF1 gene locus, is regulated by p53.
Hofer-Warbinek R, Schmid JA, Mayer H, Winsauer G, Orel L, Mueller B, Wiesner Ch, Binder BR, de Martin R. Cell Death Differ. 2004 Dec; 11(12):1317-25.