In addition, the vast majority of CCR9+ cells were CD14+ macrophages in RA synovium since 90% of these cells were CD14+ (as calculated by number of CCR9+/CD14+ ÷ CCR9+ cells × 100 in Table 1), whereas this figure was 33% in non-RA synovium. This evidence concerns the gene CCR9 and rheumatoid arthritis.