Involved in several processes, including cellular response to estrogen stimulus; positive regulation of osteoclast differentiation; and positive regulation of osteoclast proliferation. Acts upstream of or within positive regulation of macrophage fusion. Predicted to be located in membrane. Predicted to be integral component of membrane. Is expressed in mandible; maxilla; metanephros; and testis. Orthologous to human OCSTAMP (osteoclast stimulatory transmembrane protein). [provided by Alliance of Genome Resources, Apr 2022]