The immune system of vertebrates is a powerful weapon against external pathogens and cancerous cells. T cells play a crucial role in this context. They carry a special receptor called the T-cell receptor on their surface that recognizes antigens—small protein fragments of bacteria, viruses and infected or cancerous body cells—which are presented by specialized immune complexes.
Click here for original story, Immune system: First image of antigen-bound T-cell receptor at atomic resolution
Source: Phys.org