HhaI treated genomes of phages representing the 7 REA group. The DNA bands of phages treated with HhaI are displayed in lane 2–8. The genome of F14 does not display any DNA bands in lane 2 whereas the genome of F325 display a single band of DNA in lane 3 due to it being refractory to HhaI degestion. The next 5 lanes represent from the left to the right the HhaI restriction patterns of the 140 Kb phages (group II a-e). Concatemer (New England Biolabs, #N0350S) is seen in the first lane.