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Immunohistochemistry of immune checkpoint molecules. A) ATLL cells expressing PD-L1. B) Stromal cells, positive for PD-L1. C) Stromal cells expressing Tim-3. D) OX40L+ stromal cells are observed.
ATLL, adult T-cell leukemia/lymphoma; PD-L1, programmed cell death ligand-1; Tim-3, T-cell immunoglobulin mucin-3; OX40L, a ligand for OX40
