CD34 and acute respiratory distress syndrome: However, we observed an elevation in the number of CD34+KDR+ cells at 72 h and in the number of all types of EPCs at 168 h in G-CSF compared to ARDS, along with elevation in the percentage of CD34+KDR+ at 72 h and CD34+KDR+ and KDR+CD133+ at day 7 (Table S2).