Comparison of Sf101 with related phages. Proteins encoded by Sf101 phage were compared with those of 12 other lambdoid phages from E. coli, S. flexneri and Salmonella. The coloured arrows represent the level of amino acid sequence identity between Sf101 protein and its counterpart in other phages. The red and green colours indicate >90% and >80% identity, respectively. The purple arrows on Sf101 map represent proteins with no phage-borne homologue.