Immunogen sequence: MVWGKICWFS QRAGWTVFAE SQISLSCSLC LHSGDQEAQN PNLVSQLCGV FLQNETNETI HMQMSMAVGQ. The proto-oncogene MAS1 is a G protein-coupled receptor located on the plasma membrane. In transfected NIH/3T3 cells, MAS1 has a weak focus-inducing activit