CD4 and Arthritis: In BD patients with arthritis in our data, the frequencies of CCR7-CD62L-CD4+, CCR7-CD62L-CD8+ effector memory T cells, and CCR7+CD62L+CD4+, CCR7+CD62L+CD8+ central memory T cells were not different compared to HC or RA in PBL whole cells and in lymphocytes populations.