Complex relationships between potential tail fibers encoded by Pepy6 and Poco6. (A) Alignment of the first 56 residues of Pepy6 gp1, gp2, gp4, gp5, and gp7 with Poco6 gp1, gp2, gp3, gp5, gp6, and gp8 and the amino-terminal residues of PSSM4_087 (encoded by Prochlorococcus phage P-SSM4 genes), XF_2114 (encoded by Xylella fastidiosa prophage Xfp6 genes), and 3396_48 (encoded by Streptococcus phage phi3396 genes). Invariant residues are shaded. (B) Schematic alignment of Pepy6 gp1, gp2, gp4, gp5, and gp7 with Poco6 gp1, gp2, gp3, gp5, gp6, and gp8 and also to e15 (tail fiber, encoded by Salmonella phage epsilon15 gene), PSSM4_087 (encoded by Prochlorococcus phage P-SSM4 gene), 3396_48 (encoded by Streptococcus phage phi3396 gene) and (FRAAL2677 encoded by Frankia alni ACN14a gene). Alignment scores are color coded as indicated. Conserved domains are indicated by shaded regions.