5·End of RNA with triphosphate group Ba PPPNP phosphohydrolase P aBy GPPP GTP guanylyltransferase PPi GPPPNP adoMet guanine-7-methyltransferase adoHcy m7GpppNp adoMet 2-0-methyltransferase adoHcy m7GpppmNp (b) 5 End of RNA with cap