Fig. 3
From: On the use of 3J-coupling NMR data to derive structural information on proteins
Figure taken from Markley et al. (1998, Fig. 1)
Recommended atom identifiers for the 20 common amino acids follow the 1969 IUPAC-IUB guidelines (IUPAC-IUB Commission on Biochemical Nomenclature 1970). Backbone atoms are shown for Pro, Gly, and Ala but not for the other L-amino acids (where they correspond to those bounded by the dashed line in the Ala structure). Greek letters are used as atom identifiers.