Stimulation of HUVEC proliferation by ERC conditioned media. ERC conditioned media was generated by 5 day culture of 10 × 10(5) cells in completed DMEM media. Conditioned media was added at the indicated concentrations to HUVEC cells in 96 well plates at a concentration of 5000 cells per well. Cells were incubated for 72 hours and proliferation as assessed by thymidine incorporation. Error bars represent ± Standard Deviation.