Illustration of a T cell receptor as a glass surface model with indicated deeper ribbon model on dark background. The T cell receptor is located on the surface of T cells and is responsible for the recognition of antigens presented by MHC molecules. It can recognize foreign antigens and in this case activate the T cell. The illustration is based on structural data from Garcia, K.C., Degano, M., Stanfield, R.L., Wilson, I.A.., by medicalgraphics/F1online

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