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Description
J Biol Chem (1999) 274:1390814

Kynurenines: tryptophans metabolites in exercise, inflammation, and mental health
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Amyloid- has a high affinity for charged metals such as copper, zinc, and iron which may, in turn, promote the aggregation of this peptide (Mamelak 2007)

If you see foam or bubbles from shaking, the peptide may already be damaged