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Catalytic mechanisms of phosphoryl transfer ribozymes. (a) General mechanisms of phosphoryl transfer catalysis. (b) The group I intron, which uses a two-metal ion mechanism. (c) The hammerhead ribozyme, which uses RNA functional groups for acid–base catalysis. (d) The glmS ribozyme, which uses a small molecule cofactor. (b,d) Adapted from Strobel & Cochrane [2].
