Cytofluorimetric profile of SCF specific binding and SCF binding inhibition after coincubation with 20 μg of goat anti-human SCF neutralizing antibody in a representative case (6647, ES) of sarcoma cells. The heavy solid line represents the background of the negative staining control, the light solid line represents the SCF-FITC staining, and the dotted line represents the SCF-FITC staining after coincubation with anti-human SCF antibody.