Homocystinuria (HCU) is a rare genetic disorder present from birth. In HCU, the body is unable to break down an amino acid called methionine. This causes a build up of methionine and another amino acid called homocysteine in the eyes, brain, bones and blood vessels and can cause problems when untreated. There are two different forms of HCU. … Continue reading Homocystinuria (HCU)