Fig. 1. Cell types in Antirrhinum petals and AmMYBML1 structure. (A) Trichomes are present on both epidermal surfaces of the tube and on the outer epidermis of the petal lobes. The inner epidermis of the petal lobes comprises conical cells. The sheet of conical epidermal cells is highly folded in the region of the hinge to give an undulating surface. T. tube; DP, dorsal petal; VP, ventral petal; LP, lateral petal. (B) Phylogenetic relationships between the protein sequences encoded by R2R3 MYB proteins of subgroup 9. AtMYB16, 106 and 17 are from Arabidopsis thaliana (Kranz et al., 1998; Strake et al., 2001), PhMYB1 is from Petunia hybrida (Avila et al., 1993), AmMYBMIXTA, AmMYBML1, AmMYBML2 and AmMYBML3 are from Antirrhinum majus (Noda et al., 1994; Glover et al., 1998) (this paper). The sequences of AtMYBWER and AtMYBGL1 from Arabidopsis (which are R2R3 MYB proteins belonging to subgroup 15 of the R2R3 MYB gene family) are included as outliers (Kranz et al., 1998; Stracke et al., 2001). (C) RNA gel blot showing expression of AmMYBML1 in corollas of flower buds of different ages (between 0-5 mm and 25-30 mm long), leaves (young, yo; medium, med; old) and roots.