Interestingly, WO phages from strains wPip (Klasson et al. 2008), wMel (Wu et al. 2004), wCauB (Tanaka et al. 2009), and wRi (Klasson et al. 2009) are also integrated near some of these same genes, signifying that integration of some WO types may be preferential for this region or this region is part of the WO phage.