Enables coreceptor activity. Involved in G protein-coupled receptor signaling pathway involved in heart process and cellular response to estradiol stimulus. Acts upstream of or within G protein-coupled receptor signaling pathway. Located in plasma membrane. Is expressed in alimentary system; central nervous system; heart; lung; and metanephros. Orthologous to human RAMP3 (receptor activity modifying protein 3). [provided by Alliance of Genome Resources, Apr 2022]