Untransfected HEK293 cells (green line) and transfected Human DLL3 HEK293 stable cells (red line) were stained with anti-DLL3 antibody (rovalpituzumab-like) (2µl/1*10<sup>6</sup> cells), washed and then followed by FITC-conjugated anti-Human IgG1 Fc antibody and analyzed with flow cytometry.