Fig. 5. The maize yabby genes, zyb9, 10, 14 and 15, are homologs of FIL and YAB3. (A) Phylogenetic analysis of the Arabidopsis and maize YABBY proteins demonstrates that the maize yabby genes form a separate clade that is most closely related to FIL and YAB3. Bootstrap values based on 1000 repetitions are indicated. Amino acid sequence alignments of the Zn-finger domains (B), and of the YABBY and C-terminal domains (C), used in the phylogenetic analysis of the maize and Arabidopsis YABBY proteins highlight the high level of sequence conservation in these domains of all YABBY proteins. Identical amino acids are shaded dark gray; similar amino acids are shaded light gray. GenBank Accession numbers are: zyb9, AY313903; zyb10, AY313904; zyb14, AY313901; zyb15, AY313902.