Predicted to enable signaling receptor binding activity. Acts upstream of or within negative regulation of neuron differentiation; neurotrophin TRK receptor signaling pathway; and positive regulation of neuroblast proliferation. Located in cytoplasm and nucleus. Orthologous to human BEX1 (brain expressed X-linked 1) and BEX2 (brain expressed X-linked 2). [provided by Alliance of Genome Resources, Apr 2022]