CXCL10 and rheumatoid arthritis: Although heterogeneity in the relative presence of CXCL10(1–73) and CXCL10(1–77) was detected in our cohort of RA patients, we found that mean concentrations of CXCL10(1–73) were relatively increased compared to CXCL10(1–77) (Fig. 1A).