Purity > 90% as determined by SDS-PAGE. MW: 48.9kDa. Partial: 1-308aa. N-terminal 6xHis-SUMO-tagged. Mus musculus (Mouse). Involved in the regulation of apoptosis versus cell survival, and in the maintenance of viability but not of proliferation. Mediates its effects by interactions with a number of other regulators of apoptosis. Isoform 2 has antiapoptotic activity.