A R59W mutation in human protoporphyrinogen oxidase results in decreased enzyme activity and is prevalent in South Africans with variegate porphyria
Peter N. Meissner Tamara A. Dailey Richard J. Hift Mel Ziman Anne V. Corrigall Andrew G. Roberts Doreen M. Meissner Ralph E. Kirsch & Harry A. Dailey Nature Genetics13, 95 - 97 (1996).
