Fig. 4. HUVEC proliferation assay. (A) HUVEC proliferation assay in the co-culture system (Transwell 24-well culture plate). (B) HUVEC proliferation assay with HASMC-conditioned medium treated with or without MK. The number of samples in both A and B was five, and the experiments were repeated twice with reproducible results. ^*P<0.05; ^**P<0.001.