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Serum sPD‐1 levels in various groups of CHB patients. sPD‐1 levels in healthy controls (HC) and chronic hepatitis B patients (CHB) (A) and sPD‐1 levels in CHB patients in various disease stages (B). CHB, chronic hepatitis B; HC, healthy control; IA, immune active; IC, inactive CHB; IT, immune tolerance; and GZ, gray zone (here, the gray zone refers to those patients who cannot be classified as IA, IC or IT)
