sentence: In total , 6989 and 7001 genes were found to exist homologous gene in the A and D subgenomes in G. hirsutum , respectively ; and 6806 and 6821 genes were found to exist homologous genes in the A and D subgenomes in G. barbadense , respectively ( Dataset S1 ) , indicating more than 94 % of 7070 genes can be used for ILP marker detection in tetraploid cotton species.Based on the genome of the diploid cotton species G. raimondii , we investigated the physical location of the 7,070 genes with intron-length differences between the A - and D-genome orthologs .