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block in methionine to cystein chain

type I homocystinuria can't change homocystein to cystathionine because of lack of cystathione synthase.

homocysteine builds up and is excreted in urine

symptoms-thrombosis, osteoporosis, dislocated lens, mental retardation, scoliosis, concave in chest

treatment-diet- restricted methionine, increased cystein, high vitamin B6