Immunoprecipitation of HGF/SF from S-114 cell culture supernatant by mAbs. Lane 1, positive control, purified human HGF/SF; lanes 2–6, mAbs A-1, -4, -5, -7, and -10; lanes 7–9, mAbs 7-2, -3, and -4; and lane 10, positive serum from mouse immunized with native HGF/SF. The molecular weight standards are shown on the Left.