SELL and myalgic encephalomeyelitis/chronic fatigue syndrome: At 6 months, γδ2 T cells expression of CD62L+CD11a− as well as CD62L+CD11a+ was significantly increased in the severe CFS/ME group compared to controls and moderate CFS/ME patients (p = 0.002, 0.001 and 0.045, 0.018 respectively) (Fig. 8e, f).