Genome Biology Laboratory, National Institute of Genetics, 1111 Yata, Mishima, 411-8540, Japan. akajita@lab.nig.ac.jp|Genome Biology Laboratory, National Institute of Genetics, 1111 Yata, Mishima, 411-8540, Japan. akajita@lab.nig.ac.jp|Genome Biology Laboratory, National Institute of Genetics, 1111 Yata, Mishima, 411-8540, Japan. akajita@lab.nig.ac.jp