The lap5 and lap6 defects map to At4g34850 and At1g02050, respectively. LAP5, LAP6, and At4g00040 have gene structures similar to CHS/STS family members, including the conserved position of an intron separating the first and second nucleotides in a Cys codon (TGC). Exons are shown as black rectangles. Positions of the lap5-1 and lap6-1 point mutations and the lap6-2, lap6-3, and At1g00040 insertions are indicated with black triangles.