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GRE classifications and subclasses and their substrates. Glycyl radical enzymes are divided into seven classes: anaerobic or class III ribonucleotide reductases, formate lyases, decarboxylases, isomerases, 1,2-eliminases, X-succinate synthases, and aminoacyl radical enzymes. 1,2-eliminases and X-succinate synthases are further subclassified. The bond that is cleaved in each substrate or formed in a product is indicated by a dashed red line.
