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. Author manuscript; available in PMC: 2019 Dec 10.
Published in final edited form as: Angew Chem Int Ed Engl. 2018 Oct 19;57(50):16375–16379. doi: 10.1002/anie.201809060

Figure 2.

Figure 2.

19F MAS NMR spectra of 5-19F-Trp,U-15N CA tubes (11.74 T; MAS frequency 4 kHz (a), and 19.96 T; MAS frequency 15 kHz (b)). The inset in (a) shows the W23 resonance.