| prov:value
| - Whereas PD-L2 expression is mostly restricted to innate immune cells such as dendritic cells (DCs) and macrophages, PD-L1 is expressed not only on hematopoietic cells including T cells, B cells, mast cells, DCs, monocytes, and macrophages but also on several parenchymal tissues including the vascular endothelium and epithelium of multiple organs [1, 4, 46, 50, 51].
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