Monarch Disease Ontology id MONDO_0019263 (autosomal erythropoietic protoporphyria) can be described as follows. Erythropoietic protoporphyria (EPP) is an inherited disorder of the heme metabolic pathway characterized by accumulation of protoporphyrin in blood, erythrocytes and tissues, and cutaneous manifestations of photosensitivity. Also known as: EPP.