The human body is an amazing instrument with the ability to heal itself from a variety of different maladies. A T cell (depicted in the video above) is one of the immune system's responses to external threats. These cells identify and attack diseased cells in order to eradicate them from the host's body. A cytotoxic T cell, which is what the above cell is classified as, exists with the single purpose of going around looking for cancerous cells, whereupon is eradicates them without causing any damage to the healthy cells in the area.
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