Predicted to enable signaling receptor binding activity. Predicted to be involved in T cell receptor signaling pathway; negative regulation of activated T cell proliferation; and negative regulation of cytokine production. Predicted to be integral component of membrane. Predicted to be active in external side of plasma membrane. Orthologous to human BTN1A1 (butyrophilin subfamily 1 member A1). [provided by Alliance of Genome Resources, Apr 2022]