Protein expression analysis: Human PD-1, PD-L1 and CCR8 proteins were detected in homozygous B-hPD-1/hPD-L1/hCCR8 mice, but not in wild-type mice. In vivo efficacy of anti-human PD-1 and CCR8 antibodies: Anti-human PD-1 antibody combined with an anti-human CCR8 antibody controlled B-hPD-L1 MC38 plus tumor growth in B-hPD-1/hPD-L1/hCCR8 mice.
