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A 15N CPMAS spectrum of the lyophylized and rehydrated RNA sample obtained at a spinning speed of 7000 Hz and temperature of approximately –15°C employing a data acquisition time of 20 ms with CP contact time of (A) 3 ms and (B) 175 µs. Spectra A and B were respectively collected employing a recycle time of 10 s and 2 s and with 1296 and 512 transients. The chemical shifts are referenced to liquid NH3 assuming that solid NH4Cl has a chemical shift of 38.5 p.p.m.
