Summary: 10 participants aged 3 years and over with tyrosinaemia or alkaptonuria will be prescribed Tyr sphere following an assessment of their individual needs by their dietitian. All participants will enter a 4-week evaluation period, assessing adherence and gastrointestinal tolerance. Evaluations of Tyr sphere's palatability are made at the end of the evaluation period. Dried blood spots are taken on da...

Summary: The purpose of the registry/repository is to understand the natural history of tyrosinemia in our region and to provide a mechanism to store data and specimens to support the conduct of future research about hereditary tyrosinemia among the Arabs.