Bcl rambo shares common structural characteristics with other members of the anti-apoptotic Bcl2 family members, but differs from them at its C-terminus, where a 250 amino acid sequence preceeds the membrane anchor region. It also differs from other pro-apoptotic Bcl-2 family members in that its membrane anchor C-terminus region is responsible for its apoptotic activity, not its Bcl-2 homology motifs. Bcl rambo may promote the activation of caspase-3 and apoptosis.