Tgm9-insertion mutants were named using an initial 'T9' with a nomenclature similar to that used for other mutant types in SoyBase. The location of each Tgm9 insertion was identified by using BLAST to find the location of the element's flanking sequence. The location was determined in both the Wm82.a1 and Wm82.a2 soybean genome assemblies (http://soybase.org/aboutgenomenomenclature.php). The proportion of exons and introns in the soybean genome sequences that were mapped to chromosomes were calculated by considering the predicted exonic and intronic sequences in the Wm82.a2 genome assembly (1).