Fig. 1

Endothelial progenitor cells are diminished and differentially impaired in patients with ANCA-associated vasculitis (AAV). a Circulating endothelial progenitor cells (EPC) are diminished in patients with active or inactive disease as compared to HC. b, c In patients, proliferative capacity of EPC of the endothelial cell-forming colonies (ECFC) type is impaired whereas colony-forming units-endothelial cells (CFU-EC) EPC are unaffected. Horizontal bars represent the mean value. **p value < 0.005. AAV-a AAV patients with active disease, AAV-r patients in remission, HC healthy controls