![Escherichia coli Thymidylate Synthase: Amino Acid Substitutions by Suppression of Amber Nonsense Mutations]()
Escherichia coli Thymidylate Synthase: Amino Acid Substitutions by Suppression of Amber Nonsense MutationsMark Leo Michaels, Choll Wan Kim, David A. Matthews and Jeffrey H. Miller · Proceedings of the National Academy of Sciences of the United States of America · 1990