We thank Rodriguez P, Gautier A and Bensaude O for suggestions on the paper. We thank professor Thomas P Sakmar for generous gift of the tRNACUA/AzFRS pair and Dr Frank Kao from Flow Cytometry Support in Centenary Institute for bone marrow cell sorting. We also thank Jiwei Chen in East China Normal University for analyzing the RNA-Seq data. This work was supported the State Key Development Programs of China (2012CB910400 to ML), the National Natural Science Foundation of China (31371455 and 31171318 to DL, 81330049 to ML, and 31528007 to SY and CY), and the Science and Technology Commission ofShanghai Municipality (14140900300 to DL). Other financial supports were provided by the ECNU Fund (short- term visiting fellowship to YC), the Chinese Scholars Council (CSC fellowship to MT), the Agence Nationale de la Recherche of France (ANR-JCJC ChemProbe to SY) and US National Institutes of Health (1R01GMl18384-01 to LW).
Dear Editor, The genetic code can be expanded to encode unnatural amino acids (Uaas) by introducing an orthogonal tRNA/ aminoacyl-tRNA synthetase (aaRS) pair to decode a stop codon. Initially developed in Escheric...