Both CD105+ subpopulations (CD200−CD105+ and CD200+ CD105+) were significantly higher in the RA samples, although the differences were less pronounced in the non-hematopoietic cells, while only CD200+CD105+ hematopoietic cells were more abundant in the RA samples, and the proportion of CD200+CD105− cells was not different from the controls (Figure 2b). The gene discussed is CD200; the disease is rheumatoid arthritis.