The function of RALGAPB (Ral GTPase activating protein non-catalytic subunit beta, Ensembl gene identifier ENSG00000170471) is as follows. Non-catalytic subunit of the heterodimeric RalGAP1 and RalGAP2 complexes which act as GTPase activators for the Ras-like small GTPases RALA and RALB. .