Arabidopsis Proteins Iron-Sulfur Proteins Journal Article Nfu2 protein, Arabidopsis Research Support, Non-U.S. Gov't chloroplast AT4G01940 protein, Arabidopsis Amino Acids, Branched-Chain Arabidopsis Arabidopsis thaliana Chloroplast Proteins NFU2 NFU3 protein, Arabidopsis branched-chain amino acids development iron–sulfur cluster iron–sulfur protein photosynthesis protein–protein interactions quantitative proteomic analysis