Programmed death 1 and programmed death ligand 1 expressions in patients with chronic hepatitis B

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BACKGROUND: The role of programmed death 1 (PD-1) and programmed death ligand 1 (PD-L1) in persistent HBV infection is controversial. Increasing PD-1 and PD-L1 expression has been found in hepatitis B patients during immune clearance phase, but not in HBV
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