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Alignment of putative tubular tail A homologs by HHPRED. Sequence alignments were produced with the HHPRED global alignment option. Predicted secondary structure elements were then graphed in accordance with the sequence alignments. The N-terminal segment dominated the alignment in local alignment mode. Blue—predicted beta strand; Red—predicted alpha helix. The P22 gp4 secondary structure is from X-ray crystallography (Olia et al., 2011).
