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When a T cell recognizes a certain part of a pathogen's peptide sequence, scientists call that area an "epitope."

While Fas plays an essential role in regulating immune cells, Tushir-Singh and his colleagues knew they might be able to target cancer cells selectively if they found the right epitope.

The word "epitope" means the substance that the immune system recognizes and protects against.

Others, such as epitope tagging, use antibodies to track marked proteins, revealing their location and abundance in cells and providing hints about their function.

B cells respond most strongly when each arm attaches to a different epitope.