Cell functional assays in H1650 and Sf767 cells. MTT assay (A) showed decreased metabolic activity in presence of Slit2 and heparin. Neutral red assay (B) showed decreased cell viability with Slit2 and heparin treatment. BrdU assay (C) and WST-II assay (D) showed slight down-regulation in cell proliferation with Slit2 and heparin.