PD-1/PD-L1 Pathway (IMAGE) Science China Press Caption This is the mechanism of PD-1/PD-L1 pathway. Credit ©Science China Press Usage Restrictions Use with credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.