Figure 2.

Structure of the na2 locus and alleles. Exons are depicted as white boxes, the intron as a bent black line, and the sequence encoding the putative FAD-binding domain as a small gray box. Alleles are indicated with dashed lines for single-nucleotide polymorphism variations in na2-1, na2-2, na2-3, and na2-4 and a triangle at the site of the Mu13 transposable element insertion in na2-5. The amino acid substitution that results from each single-nucleotide polymorphism is specified above each allele designation, with an asterisk indicating the induction of a stop codon.