Illustration of the binding of the surface protein PD-L1 to PD-1 as a glass surface model with indicated deeper ribbon model on a dark background. Programmed cell death 1 ligand 1 is involved in the inhibition of the immune response together with the receptor PD-1. PD-1 (red) is found on the surface of T cells and interacts with the ligand protein PD-L1 which is found on the surface of regulatory cells, such as the cells presenting antigens from invaders. Illustration based on structural data from Lin, D.Y., Tanaka, Y., Iwasaki, M., Gittis, A.G., Su, H.P., Mikami, B., Okazaki, T., Honjo, T., Minato, N., Garboczi, D.N.., by medicalgraphics/F1online

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