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Representative flow cytometry analysis of PD-1 (A,C,E,G,I,K,M,O) and PD-L1 (B,D,F,H,J,L,N,P) expression in patients with psoriasis (A–H) and healthy controls (I–P). Pink color—CD3+ T-cells, blue—CD4+ T-cells, red—CD8+ t-cells, and purple—CD19+ cells.
