Construct: Amino acid replacement: R?H. Amino acid replacement: E?F. Amino acid replacement: K?N. Amino acid replacement: Q?R. Amino acid replacement: I?R. Amino acid replacement: A?R. Amino acid replacement: E?R. R?H, E?F, K?N, Q?R, I?R, A?R and E?R map to amino acids 21, 22, 23, 24, 28, 29 and 30 of the Dr homeodomain, respectively.