homocysteine

Etymology
.

Noun

 * 1)  An amino acid which is monitored in the blood to estimate risk of  disease.
 * 2) * 1989, L. A. Smolin, N. A. Benevenga, Chapter 8: Methionine, Homocyst(e)ine, Cysteine—Metabolic Interrelationships, Mendel Friedman, Absorption and Utilization of Amino Acids, Volume 1, CRC Press, page 170,
 * One possible explanation for the low plasma cystine in homocystinuric patients who are given sufficient dietary cystine is the high plasma concentration of the cysteine-homocysteine mixed disulfide.
 * 1) * 2000, Donald W. Jacobsen, 3. Biochemistry and Metabolism, Killian Robinson (editor), Homocysteine and Vascular Disease, Kluwer Academic, page 15,
 * Homocysteine, a metabolite of the methionine cycle, is a strong independent risk factor for cardiovascular disease.
 * 1) * 2017, Himadri Panda, Handbook on Small & Medium Scale Industries (Biotechnology Products), Asia Pacific Business Press, page 224,
 * The amino acids produced from L-methionine and substituted thiols were identified as the corresponding S-substituted homocysteines, e.g., 2-mercaptoethanol and cysteamine produced S-(β-hydroxyethyl) homocysteine and S-(β-aminoethyl) homocysteine, respectively.

Usage notes
Not to be confused with (a different compound whose relationship with homocysteine is analogous to that of cystine with cysteine).