His stanzas variegate in length and his poetry disturbs and re-forms the routine language. Elevated urine porphobilinogen confirms diagnosis of AIP, hereditary coproporphyria (HCP), or variegate porphyria (VP). Mutations in the PPOX gene cause variegate porphyria. In South Africa, the prevalence of variegate porphyria is approximately 1 in 300. Rarely, the signs and symptoms of variegate porphyria can begin in infancy or early childhood. Some people with variegate porphyria have skin that is overly sensitive to sunlight (photosensitive). It appears they have a genetic disease, and House eventually concludes it's variegate porphyria. Variegate porphyria is caused by mutations in the PPOX gene. His descendant Prince William of Gloucester was reliably diagnosed with variegate porphyria in 1968. Variegate porphyria and hereditary coproporphyria can also exhibit symptoms of light-induced blisters. Other common names for this ray include Bleeker's variegate ray and ocellate whipray.