Predicted to enable identical protein binding activity and signaling receptor binding activity. Predicted to be involved in T cell receptor signaling pathway and positive regulation of interleukin-4 production. Predicted to be located in cytoplasmic ribonucleoprotein granule and plasma membrane. Predicted to be integral component of plasma membrane. Predicted to be active in external side of plasma membrane. Orthologous to human ICOSLG (inducible T cell costimulator ligand). [provided by Alliance of Genome Resources, Apr 2022]