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These initial studies reported increased NAD + and NAM levels in plasma, and in urine, the excreted NAD + levels increased after 6 h 66 , but it must be noted that these trials utilized small cohorts and short testing periods, and only a minor trend for cognitive improvement was observed 117

Thus, modulating the Fc:FcRn interaction to prolong plasma half-life and attain a favorable biodistribution is a clinical success, and several clinical-stage candidate therapeutics harbor either the YTE or LS amino acid substitutions, or a more recently reported triple Fc mutant variant (Q311R/M428E/N434W

Annu Rev Pharmacol Toxicol 45: 5188

Int J Radiat Oncol 84(3):S842, 2012