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A simple spectroscopic filtering technique is presented that may aid the assignment of 13C and 15N resonances of methyl-containing amino-acids in solid-state magic-angle spinning (MAS) NMR. A filtering block that selects methyl resonances is introduced in two-dimensional (2D) 13C-homonuclear and 15N–13C heteronuclear correlation experiments. The 2D 13C–13C correlation spectra are recorded with the...
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