- A mutation in the gene for delta-aminolevulinic acid dehydratase (ALAD) causes hypochromic anemia in the medaka, Oryzias latipes. Sakamoto, D., Kudo, H., Inohaya, K., Yokoi, H., Narita, T., Naruse, K., Mitani, H., Araki, K., Shima, A., Ishikawa, Y., Imai, Y., Kudo, A. Mech. Dev. (2004)