O CHa HN 7-Methyl- guanosine HN N CH,O 0-P=0 OH OH 0-P-0 5, 5-Triphosphate 0-P0 H2O、Bas HH O OCH Sometimes methylated CH2O、Base HH OOCH3← Sometimes thylated
5′ End of rna with triphosphate group pppNp phosphohydrolase p N pNp G GTP guanylyltransferase PP GpppNp adoMet guanine-7-methyltransferase doRcy GpppNp doMet 2-O-methyltransferase doho m'GpppmNp (b) 5' End of RNA with cap