Fig. 1From: Plasma interleukin-21 levels and genetic variants are associated with susceptibility to rheumatoid arthritisPlasma IL-21 levels in subjects with RA (n = 211) and healthy controls (n = 303). Data represented the mean IL-21 ng/mL ± SD and were compared by Mann Whitney U test. P < 0.05 was deemed to be significantly positiveBack to article page