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Results of Trp and Asn mutagenesis of S3. An α-helical wheel (A) and a net (B) diagram of S3 are shown as in Fig. 7. *Residues that were tested by Asn substitution. Striped circles represent ambiguous residues on the basis of Asn mutants, as discussed in text. (C) A restricted helical wheel diagram limited to the first 14 residues of S3.
