Additional file 4: of HIV-1 and HIV-2 exhibit similar mutation frequencies and spectra in the absence of G-to-A hypermutation RawsonJonathan LandmanSean ReillyCavan ManskyLouis 2015 Figure S1. Bias of transversion spectra toward C-to-A and G-to-T mutations. The transversion spectra for HIV-1 and HIV-2 biological samples and plasmid controls are illustrated, revealing a clear bias toward C-to-A and G-to-T transversion types, particularly for the plasmid controls.