because cycloheximide , which blocks ribosomal protein biosynthesis , did not inhibit in vitro production of the trh-homologous peptide and the his-pro cyclic dipeptide , these peptides , like trh , most likely arise from post-translational cleavage and processing from pre-existing macromolecular precursor proteins .
C0597295
ribosomal protein biosynthesis
C1519614
translational