Biologically Active Substance
homocysteine Audio
ho·mo·cys·teine
Subclass of:
Amino Acids, Sulfur
Definitions related to homocysteine:
  • A thiol-containing amino acid formed by a demethylation of METHIONINE.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • Aminoacid with the side chain -CH2CH2SH, an intermediate in the biosynthesis of cysteine from methionine.
    CRISP Thesaurus
    National Institutes of Health, 2006
  • 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.
    NCI
    U.S. National Cancer Institute, 2021
  • An amino acid formed as part of the normal breakdown of protein.
    Harvard Dictionary of Health Terms
    Harvard Medical Publishing, 2011
  • Plasma and urine homocysteine tests are indicated in the screening and diagnosis of different types of homocystinuria. The reference range of plasma homocysteine may vary with the technique used.
    Medscape
    WebMD, 2025
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