Effect of a medium conditioned by CD34⁺ cells on proliferation of HUVECs.

HUVECs were cultured for 4 days in a HUVEC culture medium, serum-free medium (SFM), or serum-free medium conditioned by CD34⁺cells or BFU-E–, CFU-GM–, and CFU-Meg–derived cells. The experiment was repeated 3 times with similar results.