Hawaiian Bobtail Squid (IMAGE) Penn State Caption Hawaiian bobtail squid. Two genetic factors that control the expression of a key gene required by the luminescent bacteria that inhabit the squid's light organs to kill competing bacterial cells have been identified. Credit Nate Follmer, Penn State Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.