Proportions of chemokine receptor expressing memory Th cells differ between ACPA+ and ACPA− RA patients. a Fraction of CD4+ T cell population within the total lymphocyte population of 27 ACPA+ and 27 ACPA− patients with RA. b Fraction of memory CD4+ T cell population within the total CD4+ T cell population of 27 ACPA+ and 27 ACPA− patients with RA. c Chemokine receptor and CD161 expression on peripheral blood memory (CD45RO+) CD4+CD25− T cells from matched ACPA+ and ACPA− patients with RA, measured by flow cytometry. For statistical analysis Wilcoxon matched-pairs signed-ranks test was performed (* = p < 0.05).