Confluent HUVEC monolayers were seeded in 0.5% gelatin-coated 96 well-plates (15,000 cells/cm2) in EGM-2. A scratch was made using a 10 μl pipette tip. HUVECs were then incubated for 12 h with CM or control medium, which were supplemented with 2 mM hydroxyurea (Sigma-Aldrich) to inhibit proliferation. HUVECs were imaged at 0 and 12 h using a Leica DMi1 inverted microscope and the scratch area quantified using ImageJ.
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