Immunogen sequence: DYESGDISFY NMNDGSDIYT FSNVTFSGPL RPFFCLWSSG KKPLTICPIA DGPERVTVIA NAQDLSKEIP LSPMGEDSAP RDADTLHSKL IPTQPSQGA. BTN1A1 (Butyrophilin) is the major protein associated with fat droplets in the milk. It is a member of the immunoglobulin su