Antiapoptotic protein which protects cells uniquely from Fas- induced apoptosis. Regulates Fas-mediated apoptosis in neurons by interfering with caspase-8 activation. May play a role in cerebellar development by affecting cerebellar size, internal granular layer (IGL) thickness, and Purkinje cell (PC) development. . This is the function of FAIM2 (Fas apoptotic inhibitory molecule 2, Ensembl gene identifier ENSG00000135472).