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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.
