A negative relationship between LTR density/100-kb ( x axis) and satellite monomer identity ( y -axis) in all the chromosomes from the three genomes. Light red, cyan, light green, and purple points represent the centromeric region from Bd21-CEN, Bst99-CEN, BhD, and BhS subgenome of IBd483-CEN genomes. Several large subblocks of satellite arrays in BhS4, BhS7, Chr05, Chr07, Chr08, and Chr1 were far apart and analyzed separately (as illustrated in Additional file 1 : Fig. S18b-c). T -test, * P < 0.05, ** P < 0.01, *** P < 0.001
