The function of Ensembl gene identifier ENSG00000181467 (RAP2B, RAP2B, member of RAS oncogene family) is as follows. Small GTP-binding protein which cycles between a GDP-bound inactive and a GTP-bound active form. Involved in EGFR and CHRM3 signaling pathways through stimulation of PLCE1. May play a role in cytoskeletal rearrangements and regulate cell spreading through activation of the effector TNIK. May regulate membrane vesiculation in red blood cells. {ECO:0000269|PubMed:11877431, ECO:0000269|PubMed:15143162, ECO:0000269|PubMed:16540189}.