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Alignment of ETA, ETB, ETC, ORF1, ShETA, and ShETB. Conserved and identical amino acids are shaded. The multiple alignment was constructed by MacVector software (Genetics Computer Group, Oxford, England) using Clustal W. Amino acids corresponding to the catalytic triad of the S2 family of serine proteases (36) are boxed. Accession numbers are P09331 (ETA), AAA26628 (ETB), BAA99412 (ETC), BAB08178 (ShETA), and BAA99411 (ShETB).
