Clonogenic progenitor cells in RA patients.

The left bars represent the mean number (± SD) of CFU-GM and BFU-E obtained by 10⁷ BMMCs in 25 patients with RA and 25 healthy controls using clonogenic progenitor cell assays. The right bars represent the mean colony values (± SD) obtained by 5 × 10⁴ highly purified immunomagnetically sorted CD34⁺ cells in 12 patients with RA and 21 healthy controls. Comparison between patient and control values was performed by means of the nonparametric Mann-Whitney test.