?:definition
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Catalysis of the reaction: GTP + (5\')pp-Pur-mRNA = diphosphate + G(5\')ppp-Pur-mRNA; G(5\')ppp-Pur-mRNA is mRNA containing a guanosine residue linked 5\' through three phosphates to the 5\' position of the terminal residue. [EC:2.7.7.50]
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