SEARCH Articles Figures Tables Expressed protein ligation Expression protein ligation, expressed Expression, proteins Isotope isotopic labeling Isotope label Isotope-labeled proteins Isotope-labelled Isotopic labeling Isotopic labelled Isotopic labelling Isotopic labels Isotopical labeling Labeling segmental Ligate Ligation Ligator Protein labels Protein ligation Protein segmental labelling Proteins labeling Proteins labelled Segmental isotopic labeling