Involved in the induction of apoptosis. May act as a Ras effector protein. May suppress the serum-induced basal levels of NF-kappa-B. Interacts with MOAP1. Interaction with activated KRAS is still a matter of debate: interaction has been shown in the mouse (PubMed:17404571), but not in human (PubMed:17367779). Lack of interaction with MRAS, NRAS nor RRAS2 has also been reported (PubMed:17367779). Extended N-terminus.