FIG 3.
All-against-all comparison of phage proteins using BLAST. A BLAST hit is considered significant if 50% of the alignment consists of identical matches and the length of the alignment is 50% of the largest gene. Groups are marked in different colors: red, subgroup II L. lactis P335 phages; white, atypical S. thermophilus phages CHPC577, CHPC926, CHPC1151, and 5093; green, typical cos-type and pac-type S. thermophilus phages available in GenBank.