Multiple sequence alignment of 13 DREB/CBF homologs. Amino acid residues highlighted in black were conserved in more than half of the sequences; residues highlighted in gray share similar chemical properties. Amino acid positions and consensus sequences are shown at the top of each panel. The conserved AP2 DNA-binding domain is indicated as the underlined segment. Stars and triangles indicate the CBF signature sequences; squares indicate the LWSY domain; circles indicate the conserved motif among CBF homologs.