They removed an ampicillin antibiotic resistance gene and replaced it with a fragment of DNA (converted into ASCII code and then to base 4) that encoded the World War II slogan "Make Do and Mend." That slogan came from the title of a pamphlet issued by the British Ministry of Information encouraging homemakers to repair and reuse clothing during wartime.
Consider the near-ubiquitous ASCII code representing the 128 characters, including numbers and alphanumeric text, used in communications such as plain-text e-mail.
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