For example, NMR-titration experiments of non-glutathionylated poplar GrxC4 or ScGrx8 with GSH required high glutathione concentrations to detect chemical shifts 47,48 (and titrations of active site serine mutants with GSSG cannot discriminate between both glutathionyl moieties)
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The pharmaceutical versions are engineered to resist that breakdown, which is why a single injection of semaglutide can keep working for an entire week
Eumelanin is responsible for darker pigments, while pheomelanin creates lighter, more reddish-yellow tones
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Keeping records of which peptides were active during different periods helps correlate changes with specific additions