the confronting nucleotides with only 7-methyl guanine as a methylated component , m7g5'pppa and m7g5'pppg , were not detected at any incubation time , and it was concluded that methylation at the 2'-position of the 5'-terminal purine nucleoside of mrna precedes methylation of the 7-position of the blocking guanosine .
C0034136
purine nucleoside
C0018330
guanosine