图1. 在蛋白质中引入非天然氨基酸的标记方法.红色为核磁共振可检测的氨基酸或原子核,蓝色为天然非标记氨基酸
Fig.1. Unnatural amino acids (UAA) labeling strategies for proteins. NMR active nuclei or residues are shown in red, and the other unlabeled natural residues are shown in blue