Predicted to enable GTPase activator activity; protein homodimerization activity; and small GTPase binding activity. Involved in several processes, including cellular response to glial cell derived neurotrophic factor; negative regulation of GTP binding activity; and negative regulation of thyroid gland epithelial cell proliferation. Located in several cellular components, including dendrite; early endosome; and neuronal cell body. Orthologous to human RAP1GAP (RAP1 GTPase activating protein). [provided by Alliance of Genome Resources, Apr 2022]