Intron distribution patterns in the coding sequence of the bHLH domain of
SlbHLHs. Scheme of the intron distribution patterns (color coded and designated I to XI) within the bHLH domain of SlbHLHs. Position of introns is indicated by triangles and numbered (1 to 3) based on the bHLH region of PIF3, which is shown at the top. When the position of the intron coincides with that found in PIF3, the intron number is given above the triangle. The count and percentage of genes in each pattern are given on the right.