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The cyclic structure and the D-residue introduce their own verification questions: mass spectrometry confirms composition but cannot distinguish a D-phenylalanine from an L, since the two are isobaric, and cyclization changes mass by only the loss of water relative to the linear precursor
Key Takeaway: Vitamin C acts as a biological recharger for glutathione
It was like, hey, you didnt need to take that on
32 (4): p
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Unlike most other peptides, KPV is not deactivated by digestion, allowing it to be dosed orally and act locally in the GI tract
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