Construct: Amino acid replacement: R?H. Amino acid replacement: E?F. Amino acid replacement: K?N. Amino acid replacement: Q?R. Amino acid replacement: R?S. Amino acid replacement: T?R. Amino acid replacement: V?T. R?H, E?F, K?N, Q?R, R?S, T?R and V?T map to amino acids 21, 22, 23, 24, 39, 43 and 45 of the Dr homeodomain, respectively.