Anti-butyrophilin like 3 antibodies are used in the immunodetection of the protein encoded by the BTNL3 gene. In humans, the canonical protein has a reported length of 466 amino acid residues and a mass of 52.3 kDa. Its subcellular localization is in the membrane. Alternative splicing is reported to yield 2 different isoforms for this protein. It is reported to be expressed in small intestine, colon, testis, spleen, and leukocyte. The butyrophilin like 3 protein is a member of the BTN/MOG protein family. Other names for this target antigen include BTNLR, butyrophilin-like protein 3, butyrophilin-like receptor, and BTN9.1.