Siepker, Lydia, Johanna2018-02-132018-02-131986-06https://hdl.handle.net/10539/23848This thesis was undertaken to determine if there is any interrelationship between the two terminal enzymes of the haem biosynthetic pathway, protoporphyrinogen oxidase (PPO) and ferrochelatase, with particular reference to porphyria variegata (PV) and erythropoietic protoporphyria (EPP)• It has previously been found that both enzymes were deficient in PV and EPP, there being a qualitative difference in so far as ferrochelatase deficiency is concerned.enFerrochelataseProtoporphyrinogen OxidasePorphyria, VariegateProtoporphyria, ErythropoieticThesis