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Additionally, our group recently demonstrated that neopterin is secreted by human brain cells, neurons, astrocytes, and microglia after LPS or IFN-g challenge [17]

Note that the side chain of glutamate and the amide of cysteine are joined through a g-peptide linkage

PMID: 36739919

[118] Methionine synthase [edit] Methionine synthase, coded by MTR gene, is a methyltransferase enzyme which uses the MeB 12 and reaction type 2 to transfer a methyl group from 5-methyltetrahydrofolate to homocysteine, thereby generating tetrahydrofolate (THF) and methionine

If someone is using it for longevity, are they actually doing the basics that make longevity possible in the first place