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PMID: 30709742 Title: Microbiota Sensing by Mincle-Syk Axis in Dendritic Cells Regulates Interleukin-17 and -22 Production and Promotes Intestinal Barrier Integrity Product/Service Type: Biochemicals Science , 364(6436): pii: eaav0748

Both AA-NAT and serotonin availability play a role limiting melatonin production

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[DOI] [PubMed] [Google Scholar] 115.Kang SS, Jeraldo PR, Kurti A, Miller ME, Cook MD, Whitlock K, Goldenfeld N, Woods JA, White BA, Chia N, Fryer JD

A structurally and mechanistically distinct compound is the erythropoietin (EPO)-derived peptide ARA 290, an 11-amino acid polypeptide (pEEELERALNSS) [176]

In these cases, injections improve laboratory markers and help resolve symptoms tied to deficiency, such as fatigue, anemia, and certain neurological issues