Fig. 1. The structure of wild-type and mutant alleles of ETT and
ARF4. (A) Genomic structure of ETT and
ARF4, and the nature and position of mutant alleles of these genes.
Grey box, exon; blue, conserved DNA binding domain; red, tasi-ARF target site;
green, domains III and IV; triangle, T-DNA insertion. (B) RT-PCR
analysis of ARF4 mRNA in arf4 mutants. PCR amplification was
performed with exon primers that flanked the site of the mutation.