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(A) Tandem guanine and PRPP aptamers form an IMPLY logic gate to determine the state of downstream gene expression (express.). (B) Tandem S-adenosylmethionine (SAM) and adenosylcobalamin (AdoCbl) riboswitches form a NOR logic gate. (C) Tandem T box RNA and ppGpp riboswitches form an AND logic gate. The T box and ppGpp riboswitch elements can occur in either order.
