L. Top left, flower of I. campanulata
. Bottom left, flower of I. hians
. Bottom right, flower of I. burtonii
. Top right, visual comparison of intron lengths related to intron position in def1
. The genes are displayed as bars with exon lengths and number of corresponding amino acids given in brackets. Introns rise as bubbles above the insertion position. Intron lengths are given. Locks mark introns that exhibit similar or equal substitution rates at terminal branches. Photographs by Steven B. JANSSENS. See VOLKMAR et al., pp. 134–148 in this issue.