?:definition
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Catalysis of the joining of two groups within a single molecule via a carbon-nitrogen bond, forming heterocyclic ring, with the concomitant hydrolysis of the diphosphate bond in ATP or a similar triphosphate. [EC:6.3.3.1, EC:6.3.3.2, EC:6.3.3.4, GOC:jl, GOC:mah]
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