FUT1 and infection: Zones of DAPI fluorescence consistent with host chromosomal DNA were also present outside of the nucleus in every RAY infection, unlike previously characterized nucleus-forming phages, which degrade the host DNA,7,8,10 but similar to Serratia phage PCH45.11 To determine whether the extranuclear DAPI staining was due to host DNA, we tagged the Erwinia amylovora H-NS protein with GFP, which coats DNA, and used the H-NS-GFP fusion as a marker to visualize host DNA during phage infection, as H-NS is not imported into the phage nucleus.