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Maximum-likelihood (ML) tree based on amino acid sequence alignment of ϕYS61 ORF4, Lactococcus phage asccϕ28 ORF7, Bacillus phage ϕ29 gp2, and the 36 seed sequences of the Pfam type B DNA polymerase family (PF03175). The alignment was produced in CLC after alignment fix points had been introduced at the positions of conserved motifs ExoI, ExoII, ExoIII, CT, and motif-1, -2a, and -3 (49). Branch lengths are indicated in red.
