"F-factor" . "F-like plasmids" . "F-episome" . . "fertility factors" . "F-plasmid" . "F fertility factor" . . "F factor" . "F sex factor" . "F" . "bacterial fertility factor" . "F plasmids" . "F episome" . "F plasmid" . . "Fertility factor (bacteria)" . "f factor" . . "Fertility factor (bacteria)" . . "fertility factor F" . "fertility factor" . "fertility (F) factor" .