The BPH15 region relationship between Nipponbare and BPH-resistant rice B5. The solid and hollow arrows represent expressed and unexpressed genes and their direction, respectively. Markers g12140-2, T6 and 20M14 relate to the region in Figure 1D. The notes in brackets represent gene location on the chromosome or assembled 700-kb BAC sequences. LOC_Os04g12160: aspartic proteinase nepenthesin-2 precursor; LOC_Os04g12390: transposon protein, containing a jacalin lectin domain; LOC_Os04g12460: leucine rich repeat family protein. The genes location are listed in Additional file 4.