Fig. 4
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12916-015-0515-0/MediaObjects/12916_2015_515_Fig4_HTML.gif)
Percentages of circulating endothelial cells (CEC), endothelial progenitor cells (EPC) and circulating fibrocytes in patients with idiopathic pulmonary fibrosis treated with different therapies. Bar plots with error bars (mean + standard error of the mean) indicating (a) the percentage of CEC; (b) the amount of CD309 among CEC; (c) the percentage of EPC; (d) the percentage of EPC expressing CD309; (e) circulating collagen I+ cells; (f) the amount of CXCR4 among fibrocytes in untreated patients (UNTR) and in patients treated with pirfenidone (PIR) or nintedanib (NIN). P-values, calculated using a Kruskal–Wallis test, only significant values are displayed