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The expression of minigenes in bacteria inhibits protein synthesis and cell growth. Presumably, the translating ribosomes, harboring the peptides as peptidyl-tRNAs, pause at the last sense codon of the minigene directed mRNAs. Eventually, the peptidyl-tRNAs drop off and, under limiting activity of peptidyl-tRNA hydrolase, accumulate in the cells reducing the concentration of specific aminoacylable...