what is homocysteinemia
Homocysteine /ËhoÊmoÊËsÉªstiËn/ is a non-protein Î±-amino acid. It is a homologue of the amino acid cysteine, differing by an additional methylene bridge (-CH2-). It is biosynthesized from methionine by the removal of its terminal CÎµ methyl group. Homocysteine can be recycled into methionine or converted into cysteine with the aid of certain B-vitamins.