An Expanded Set of Amino Acid Analogs for the Ribosomal Translation of Unnatural Peptides Hartman, Matthew C. T. ; Josephson, Kristopher ; Lin, Chi-Wang ; Szostak, Jack W. Abstract Publication: PLoS ONE Pub Date: October 2007 DOI: 10.1371/journal.pone.0000972 Bibcode: 2007PLoSO...2..972H