Oxford grids between Nile tilapia and (A) stickleback, (B) medaka, (C) pufferfish. Chromosomes are named as follows : LG : Nile tilapia chromosomes; GAC : stickleback chromosomes; OLA : medaka chromosomes; TNI : pufferfish chromosomes. Conserved chromosomes or conserved segments are figured in black squares containing the number of orthologous markers that identify them. Other numbers in the grid indicate the number of singletons. Chromosomes showing no synteny breakage between the four species are bolded.