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The Hawaiian Bobtail Squid has luminescent eyes powered by light organs housing bioluminescent bacteria, Vibrio fischeri bacteria. Via quorum sensing, the bacteria are able to detect when they are assembled in large numbers by releasing autoinducers and at threshold levels, luciferase is produced for "glow-in-the-dark". In turn, the squid controls the light by flushing out 95% of the bacteria and "turns off" the light during the daytime. The remaining bacteria multiply and by night the eyes again turn on. Fascinating TED talk by Bonnie Bassler hTara Blaine

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