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(A) Difference spectra of reduced and oxidized state in 16O2 and 18O2 saturated pH 7 phosphate buffer at high range of wavenumbers for G65YCuBMb, showing the increase in intensity of the peaks from 18O2 to 16O2. (B) The SERRS-RDE 16O2/18O2 data of V68ECuBMb obtained under reducing potentials where the system is under steady state.
