Enables BH domain binding activity. Involved in several processes, including cellular response to estradiol stimulus; cellular response to organonitrogen compound; and negative regulation of release of cytochrome c from mitochondria. Located in mitochondrial membrane. Biomarker of Alzheimer's disease; epilepsy; pterygium; and transient cerebral ischemia. Human ortholog(s) of this gene implicated in transient cerebral ischemia. Orthologous to human BCL2L2 (BCL2 like 2). [provided by Alliance of Genome Resources, Apr 2022]