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The concentration of BPC157 in the animal plasma at different time points was determined by high-performance liquid chromatography-tandem mass spectrometry (LC-MS/MS)

It is likely that some steps of the biotransformation of arsenic that involve the formation of glutathione-bound species can occur also involving individual cysteine thiol groups or pairs of vicinal thiol groups in proteins, such as the catalytically essential thiol groups of enzymes and the regulatory elements of effector proteins that can be modulated by reversible glutathionylation (see further)

If you have any reason to doubt what you received, two in-house checks can catch the most common forms of adulteration without specialized equipment

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& Hadwan, M.H

Slodkowska 2009