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. Author manuscript; available in PMC: 2013 Jul 18.
Published in final edited form as: J Biomol NMR. 2010 Dec 14;49(1):27–38. doi: 10.1007/s10858-010-9458-0

Fig. 1.

Fig. 1

Definition of a PB spin system. The PB (peptide bond) spin system (circled) is the basic structural unit in the ABACUS protocol