http://www.livescience.com/57528-kill-instinct-switched-on-zombie-mice.htmlQuote (of Ivan de Araujo)
Scientists isolated neurons in mice so that they would hunt and bite almost anything, ranging from crickets to bottle caps
Quote (Source)
In a new study on mice's brain circuitry, researchers isolated neurons that cue the animals to pursue prey. The scientists also isolated a set of neurons that triggers the mice to bite and kill.
This does not bode well for mankind. It's times like this that make me glad I have plot armor.