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The 5' cap of a eukaryotic mRNA molecule, if a methyl group is added to the 7-position of the end G, the cap with only such a single methyl group is called Cap-0. Plus a methyl in the second base sugar chain 2'-O position, with the above two methyl called Cap-1. When Cap-1 is already present, the 2'-O of the third base sugar chain is also methylated, which is Cap-2.
