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Frequency of CD8+ and CD4+ T cells expressing C-X-C chemokine receptor type 5 and programmed death-ligand 1 in a single chronic hepatitis B patient at baseline. A: Frequency of C-X-C chemokine receptor type 5 (CXCR5)+CD8+ T cells; B: Frequency of CXCR5+CD4+ T cells; C: Frequency of programmed death-ligand 1 (PD-L1) +CD8+ T cells; D: Frequency of PD-L1+CD4+ T cells. CXCR5: C-X-C chemokine receptor type 5; PD-L1: Programmed death-ligand 1.
