Predicted to enable signaling receptor binding activity. Involved in several processes, including positive regulation of fat cell differentiation; positive regulation of protein phosphorylation; and regulation of insulin receptor signaling pathway. Acts upstream of or within brown fat cell differentiation. Located in extracellular region. Is expressed in genitourinary system and retina. Orthologous to human RARRES2 (retinoic acid receptor responder 2). [provided by Alliance of Genome Resources, Apr 2022]