A and B, Clinical index (A) and delta ankle thickness (B) in wild-type (WT; blue) and FcγRIIATGN (green) mice injected with either 150 μL PBS (respectively light blue and light green) or 150 μL K/BxN serum (respectively dark blue and dark green) on day 0 and day 2 (n=10). C, Flow cytometry quantification of lymph PEV in WT and FcγRIIATGN mice at the peak of arthritis severity, day 7 (n=10). **P≤0.01, using a 1-way ANOVA, followed by post hoc Tukey honestly significant difference for multiple comparisons.