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(Peptide Sciences) FOXO4-DRI is built using a D-retro-inverso peptide topology (using Damino acids, reversed sequence) which makes it highly stable and resistant to proteolysis

doi: 10.3390/antiox11081504 [DOI] [PMC free article] [PubMed] [Google Scholar] 227

These diverse phenotypes demonstrate the essential role of endolysosomal zinc homeostasis in maintaining neuronal proteostasis, systemic metal balance and tissue integrity across multiple disease contexts

The fancy-pants genetics people call these variations polymorphisms. A polymorphism is a slight difference in the DNA between people that may lead to differences in how a protein functions