Hoshino, A., Morita, Y., Choi, J.D., Saito, N., Toki, K., Tanaka, Y. and Iida, S. (2003) Spontaneous Mutations of the Flavonoid 3’-Hydroxylase Gene Conferring Reddish Flowers in the Three Morning Glory Species. Plant and Cell Physiology, 44, 990-1001.