1. The Enzymic Synthesis of Amino Acyl Derivatives of Ribonucleic Acid: II. The Preparation of Leucyl-, Valyl-, Isoleucyl-, and Methionyl Ribonucleic Acid Synthetases from Escherichia coli Publication: American Society of Biological Chemists, June 1961 Subject(s): RNAEnzymesAdenosine TriphosphateEscherichia coli Archival Collection: The Paul Berg Papers (Profiles in Science)