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A DNA coder was a metal band which transformed and regulated its wearer's DNA, allowing them to disguise themselves.
Trenix used a DNA coder, which Ann Kelso mistook for a health band, in order to take human form. The Fourth Doctor shot at Trenix with a Sinestran killrod set to stun in order to interfere with his coder, forcing him to return to his alien form and frighten away Hugo Blake and his men. (AUDIO: The Sinestran Kill)