Figure 1.

LC-MS analysis of phage 9 g base composition with modified base 2′-deoxyarchaeosine (dG⁺). The modified base dG⁺ is estimated at approximately 25–27% of total dG in the phage 9 g genome. The relative abundance of each nucleoside was determined by dividing the UV absorbance by the corresponding extinction coefficient at 260 nm. dG⁺ was quantified on the basis of the preQ₀ extinction coefficient ε264 = 10,090 M⁻¹ cm⁻¹.