Forward and side scatters of SMCs, fibroblasts, and HUVECs. (A) A mixed population of SMCs (90%) and endothelial cells from AMEC (10%); (B) from fibroblasts (70%) and AMEC (30%); (C) from fibroblasts (40%) and AMEC (60%); and (D) from pure AMEC population (AMEC-1 or AMEC-2 after 2 or 3 passages).