All species generate NADPH intracellularly, which fuels disulfide reductase systems Mammals have an NADPH-independent disulfide reductase system fueled by methionine Transsulfuation reversal allows Met-fueled reductase system yet makes Met essential Transsulfuration reversal and a Se- dependent TrxR family co-evolved with metazoans Metazoan selenoprotein TrxR1 and transsulfuration each support redox signaling Acknowledgments Funding to the authors came from the US National Institutes of Health (AG055022 and CA215784)
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Woo KS, Chook P, Lolin YI, Sanderson JE, Metreweli C, and Celermajer DS (1999)
Pharmaceutical research , 16 (9), 14121416
Here is what makes AOD 9604 fundamentally different from growth hormone itself
The animals were fasted overnight before dosing (food but not water), and then the diet was withdrawn for an additional three to four hours after dosing