Predicted to enable identical protein binding activity and protein tyrosine kinase binding activity. Acts upstream of or within T cell receptor signaling pathway and positive regulation of protein localization to cell surface. Located in Golgi apparatus and plasma membrane. Part of alpha-beta T cell receptor complex. Is expressed in several structures, including alimentary system; brain; genitourinary system; hemolymphoid system gland; and liver and biliary system. Human ortholog(s) of this gene implicated in immunodeficiency 25. Orthologous to human CD247 (CD247 molecule). [provided by Alliance of Genome Resources, Apr 2022]