This narrated animation from the HHMI shows how a cell infected by a virus signals cytotoxic T lymphocytes to kill the cell before the virus replicates and spreads.

http://www.hhmi.org/biointeractive/antigen-presentation-and-ctl

To view more resources from HHMI’s BioInteractive website, please visit: http://www.hhmi.org/biointeractive

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