Homocysteine

**Semantic type:** Organic Chemical

**Definition:** An amino acid derivative and homolog of cysteine containing an additional methylene bridge. Homocysteine is a product of methionine metabolism and elevated plasma levels are associated with cardiovascular disease, Alzheimer disease and several metabolic diseases.

**Synonyms:** - 2-Amino-4-Mercapto-Butanoic Acid - 2-Amino-4-Mercapto-Butyric acid - 2-Amino-4-Mercaptobutyric Acid - 2-Amino-4-Sulfanylbutanoic Acid - Butanoic Acid, 2-Amino-4-Mercapto- - Butyric Acid, 2-Amino-4-Mercapto- - HOMOCYSTEINE - Hcy - Homo-Cys