(color online) Stability of the base of substrate NTP. (a) Distributions of distances between the base of NTP and that of template DNA nucleotide (NTP/base–dC10/base) in systems bound with GTP, dGTP, ATP, CTP, and UTP are shown in black, red, blue, pink, and green, respectively. (b) Distributions of distances between the base of NTP and that of RNA -end nucleotide (NTP/base–rU8/base) in systems bound with GTP, dGTP, ATP, CTP, and UTP are shown in black, red, blue, pink, and green, respectively.