FAIM (fas apoptotic inhibitory molecule), also known as FAIM1, is a 179 amino acid protein that exists as multiple alternatively spliced isoforms and is thought to function as an effector molecule, possibly mediating Ig-induced Fas resistance on B cells. FAIM2 (Fas apoptotic inhibitory molecule 2), also known as LFG (Protein lifeguard), TMBIM2 (Transmembrane BAX inhibitor motif-containing protein 2) and NMP35 (neural membrane protein 35), is a 316 amino acid multipass membrane protein that uniquely protects cells from Fas-induced apoptosis. Though widely expressed, FAIM2 expression is highest in hippocampus.