Enables protein homodimerization activity. Involved in learning or memory; negative regulation of neuron apoptotic process; and positive regulation of nervous system development. Predicted to be located in cytosol and nucleoplasm. Is expressed in several structures, including central nervous system; sensory organ; skeleton; submandibular gland primordium; and trigeminal nerve. Orthologous to several human genes including ARMCX5-GPRASP2 (ARMCX5-GPRASP2 readthrough). [provided by Alliance of Genome Resources, Apr 2022]