illustration (IMAGE)

UT Southwestern Medical Center

illustration

Caption

The above illustration, in the center, shows activation of T cell immune response with the interaction of MHC-II (red) with the T cell receptor (TCR, blue), and also CD4 (light blue). CD4 and MHC-II are proteins expressed by T cells and antigen-presenting cells, respectively, to aid the recognition of antigens by TCRs.

Credit

Art purchased from Alamy and modified by Dr. Tao Wang.

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