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A DNA replication module was a technology that could cause damage from afar or control a person's actions. It required a tissue sample, such as a hair, to work.
File:A Shakespearean villain - Doctor Who - The Shakespeare Code - BBC
Lilith tries to kill the Tenth Doctor with a DNA replication module, but his binary cardiovascular system saves him. (TV: The Shakespeare Code)
By 1599, when the Tenth Doctor encountered them, the Carrionites were using the technology in the form of a doll in order to kill their victims. (TV: The Shakespeare Code)