Investigation of the PD-1/PD-L1 Expression in the Lesional Skins of Patients With Psoriasis.

Over the last two decades, highly significant advancements have been achieved regarding the pathogenetic mechanisms of psoriasis where T helper 1 (Th1) and Th 17 lymphocytes play a major role [ 1 ]. 1 Recently, new molecules and pathways responsible for regulating autoimmunity and tolerance have been defined.

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