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ho·mo·cys·tine -'sis-.tēn n an amino acid C8H16N2O4S2 formed by oxidation of homocysteine and excreted in the urine in homocystinuria
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ho·mo·cys·tine (ho″mo-sisґtēn) a disulfide homologous with cystine, formed by oxidation and subsequent condensation of two molecules of homocysteine; it is a source of sulfur in the body.Medical dictionary. 2011.