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The mRNA expressions of PD-1 and PD-L1 in the tissues from birds experimentally infected with MDV. (A) PD-1 in the spleen; (B) PD-1 in the cecal tonsils; (C) PD-L1 in the spleen; (D) PD-L1 in the cecal tonsils. Determined by real-time PCR. Means not sharing a common letter are significantly different (p < 0.05).
