a) Write down the structure of reduced glutathione "GSH" (y-Glu-Cys-Gly). b) Estimate the pl of the GSH (show the ionization steps starting from the fully protonated form). c) What is the %GSH at pH-pl? d) What is the pH at which %GSH-1 is highest? What is the %GSH-1 at that pH? e) What is the pH at which %GSH is highest? What is the %GSH at that pH? a) Write down the structure of reduced glutathione "GSH" (y-Glu-Cys-Gly). b) Estimate the pI of the GSH (show the ionization steps starting from the fully protonated form). c) What is the %GSH at pH=pI? d) What is the pH at which %GSH is highest? What is the %GSH at that pH? e) What is the pH at which %GSH2 is highest? What is the %GSH at that pH?