Denials of exempt status are about the only source of humor to be found in the entire body of private letter rulings.

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It works because many cases of muscular dystrophy are caused by mutations in the dystrophin gene (incidentally, one of the longest genes in the body) that make the entire genetic code for the protein shift by one letter.

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Mrs May's intervention came in a letter to professional standards body the College of Policing.

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