The circular genome maps of members of Bullavirinae (ΦX174) and Gokushovirinae (MH2K, Spv4, and Chp-2) are shown. The genes encoding homologous proteins are numbered and colored the same, with the exception of gene F in ΦX174 which is colored green but labeled as F for historical reasons. The unique genes among Gokushovirinae members are labeled with letters and are colored differently. The only known sgl of Microviridae, E from ΦX174, is colored in blue.