Abstract
In early studies, Hcy was identified in plasma and urine from patients with CBS or MTHFR deficiency [290, 291], but was undetectable in normal individuals. What was surprising in those studies was the inability to detect Hcy in tissues from CBS- or MTHFR-deficient patients [292, 293]. This suggested that a significant quantity of Hcy must have escaped detection by the conventional methods of amino acid analysis [294], possibly because Hcy was bound to protein via disulfide bonds and removed during the deproteinization step.
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Jakubowski, H. (2013). Discoveries of Protein S- and N-Homocysteinylation. In: Homocysteine in Protein Structure/Function and Human Disease. Springer, Vienna. https://doi.org/10.1007/978-3-7091-1410-0_4
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