Involved in the induction of apoptosis, through both caspase-dependent and caspase-independent pathways. May act as a Ras effector protein. May suppress the serum-induced basal levels of NF-kappa-B (By similarity). Interacts with MOAP1 (By similarity). 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). Highest expression in thymus, kidney and placenta. Also detected in colon, small intestine and lung. Tends to be down-regulated in 30-60% of tumors derived from breast, colon, kidney liver, rectum, pancreas, stomach and the thyroid gland compared to the normal counterpart. Truncated N-terminus. Truncated C-terminus.