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Fig. 4. Structure and evolution of GRAM and PROL. (A) A
neighbour-joining tree showing the relative similarity of the full-length
Antirrhinum and Arabidopsis YABBY proteins, suggesting their
evolutionary relationships. Bootstrap values (1000 replicates) are given. (B)
The structure of the GRAM and PROL loci and mutant alleles.
Boxes represent exons (black are translated, white are untranslated). The
regions encoding the N-terminal zinc finger domain and the C-terminal YAB
domain are stippled. Transposon insertions are shown as triangles (not to
scale); numbers denote Tam2 or Tam3.