View the animation to see how one type of immune cell—the helper T cell—interprets a message presented at the surface of the cell membrane. The message is an antigen, a protein fragment taken from an invading microbe. A series of events unfolds that results in the production of many clones of...
How a cell infected by a virus signals cytotoxic T lymphocytes to kill the cell before the virus replicates and spreads.
Short-term memory relies on serotonin activating a protein kinase to modify existing synaptic strength.
Protease inhibitors prevent maturation of viral proteins inside HIV particles.