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The T-segment motif. Multiple sequence alignment of the Ntail-α1 segment of C3-like toxins (#1–#8), Plx2A toxin (#9), and C2-like toxins (#10–#19), and definition of the T-segment (translucent green box). The functional motifs are shown in color: purple, S-motif; green, C-motif; yellow and cyan, I-motif; light brown, B-motif; and gray, T-motif. Non-synonymous substitutions are highlighted in red text. Certhrax toxin (#20) is included for comparison.
