| 摘要 |
The present invention relates to a polypeptide construct comprising at least one CDR3 region, wherein at least one of said at least CDR3 regions comprises at least one substitution in the amino acid sequence YYDDHY (SEQ ID NO.1) and wherein said at least one substitution comprises: in the first position of SEQ ID NO.1 a substitution from Y to H; in the second position of SEQ ID NO. 1 a substitution from Y to S, from Y to N, from Y to F or from Y to H; in third position of SEQ ID NO. 1 a substitution from D to N or from D to E; in the forth position of SEQ ID NO. 1 a substitution from D to Q, from D to A, from D to V, from D to E or from D to G; in the fifth position of SEQ ID NO. 1 a substitution from H to Q, from H to P, from H to Y, from H to R or from H to N; or in the sixth position a substitution from Y to N.
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