Figure 1.

Phylogenetic relationships of phage Delta with other related phages (members of Bruynoghevirus—green, Krylovvirus—red, Vicosavirus—orange and Bjornvirus—blue) and a prophage of P. tolassii, based on amino-acid sequences of major coat protein (A) and terminase (B). The evolutionary history based on protein sequences was inferred using the Maximum Likelihood method and JTT matrix-based model. Initial trees for the heuristic search were obtained automatically by applying Neighbor-Joining and BioNJ algorithms to a matrix of pairwise distances estimated using a JTT model, and then selecting the topology with superior log likelihood value. Evolutionary analyses were conducted in MEGA X [18] and the percentage of replicate trees in which the associated taxa clustered together in the bootstrap test (1000 replicates) are shown next to the branches [19]. Vibrio phage VPp1 was used as an outlier.