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Internal Biological Sensors
The biological sensors are sensors on Atlantis that are able to track living beings in the city. The sensors can also be attached to the Internal/External Biometric Sensor Array to differentiate between life forms. During the attempted takeover of Atlantis by Commander Acastus Kolya's strike force, Ladon Radim was able to use the sensors to track Major John Sheppard. (SGA: "The Eye")