- Three novel mutations of the RPGR gene exon ORF15 in three Japanese families with X-linked retinitis pigmentosa. Yokoyama, A., Maruiwa, F., Hayakawa, M., Kanai, A., Vervoort, R., Wright, A.F., Yamada, K., Niikawa, N., Naōi, N. Am. J. Med. Genet. (2001)