Hematopoietic supportive activity of EPDCs and HUVECs. (A) CAFC-like structure observed in primary culture of CEPDCs. Original magnification, × 250. (B) Cord-blood CD34⁺ cells were seeded at limiting dilutions onto a preestablished EPDC or HUVEC monolayer. EPDCs and HUVECs were seeded at passage 2. CAFC frequencies (determined at 37% of negative wells) were measured at week 5 of culture. Data shown are the means of 3 experiments.