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Zeisel SH, Warrier M
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Purity varies dramatically across suppliers A 2018 analysis published in Drug Testing and Analysis examined research peptides purchased online and found significant variability in purity and identity, with some samples containing incorrect sequences or impurities
(2015) Five Chinese patients with 5-oxoprolinuria due to glutathione synthetase and 5-oxoprolinase deficiencies, Brain Dev
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