Distribution of RNR classes in completely sequenced phage genomes displayed by phage family, environmental source of isolation, and host oxygen requirements. Each circle represents a phage categorized by phage family on the bottom horizontal axis, environmental isolation source on the vertical axis, and the oxygen consumption ability of its known bacterial host on the top horizontal axis. Each circle represents a single phage and is color-coded to reflect the RNR class or class combination identified in that particular phage.
Dwivedi et al. BMC Evolutionary Biology 2013 13:33 doi:10.1186/1471-2148-13-33