Clustering series of full-length sequences of Y-family polymerases based on their pairwise similarities. Each dot represents a single sequence and connections between them represent pairwise similarities. Results (A–C) are shown at three different similarity cutoffs defined by P-values. The number of sequences is the same in all three cases. Discerned polymerase groups are denoted by different colors and some are labeled. ImuB1 is represented by Pseudomonas aeruginosa ImuB (accession: AAG04059.1); ImuB2, Mycobacterium tuberculosis ImuB (CCP46215.1); UmuC, Escherichia coli UmuC (AAC74268.1); ‘ϵ-prot PolIV-like’, Arcobacter nitrofigilis PolIV (ADG92494.1); ‘acPolY2-like’, Acidobacterium capsulatum PolY2 (ACO33562.1); YqjH-like, Mycoplasma hominis MucB (CAX37259.1); YqjH, YqjW and UvrX, Bacillus subtilis PolY1 (CAB14319.2), PolY2 (CAB14303.1) and UvrX (CAB14068.2), respectively; UvrX-like, Bifidobacterium bifidum PolY (ADP36361.1); DinX and DinP, M. tuberculosis DinX (CCP44301.1) and DinP (CCP45865.1) respectively; ‘msDinB3-like’, Mycobacterium smegmatis DinB3 (ABK74774.1); ‘Bacteroid PolY2’, Beliella baltica DinB (AFL82914.1); ‘scDinB2-like’, Streptomyces coelicolor DinB2 (CAB50953.1); ‘gbDinB2-like’, Geobacter bemidjiensis DinB2 (ACH37529.1); PolY-core, E. coli DinB (AAC73335.1).