Alignment (a) and dendrogram (b) of the deduced amino acid sequence of the MYB domain of NtMYBAS1/2 with those of related MYB proteins. Gene, genus nomenclatures, and accession nos. are as follows: NtMYBAS1, tobacco, AF198499; NtMYBAS2, tobacco, AF198498; PhMYB3, petunia, Z13998; AtMYB101, Arabidopsis, X90379; OsMYBGa, Oryza sativa, X98355; HvMYBGa, Hordeum vulgare, X87690; AtMYB33, Arabidopsis, AF062875; AtMYB65, Arabidopsis, AF062899; AtMYB81, Arabidopsis, AF062911; AtMYB103, Arabidopsis, AF048839; HsMYBC, Homo sapiens, M15024; and DmMYB, Drosophila melanogaster, X05939. Asterisks correspond to positions of conserved Trp residues. Boxes beneath the sequences indicate the three helices in each repeat including the recognition helix (black box). Sequence alignment and dendrogram were performed by the neighbor-joining algorithm of CLUSTALW, where the scale bar represents the degree of base pair substitution per million years (Thomson et al., 1994).