Immunogen sequence: FDKTEGTWRL LCSSRSNARV AGLSCEEMGF LRALTHSELD VRTAGANGTS GFFCVDEGRL PHTQRLLEVI SVCDCPRGRF LAAICQDCGR RKLPVDRIVG GRDTSLGRWP WQVSLRYDGA HL. Hepsin, encoded by the HPN gene, is a type II transmembrane serine protease prominently expressed