The 13C and proton chemical shifts of 53 of the 55 methyl resonances of horse ferrocytochrome c have been determined by editing natural abundance 13C spectra according to the number of attached protons, observing the temperature dependence of the chemical shifts, and correlating 13C and proton chemical shifts in two-dimensional spectra. Previous assignments of proton shifts allow 16 of the 13C resonances to be assigned firmly.
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Santos et al. (1985) studied this question.
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