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Pseudogenes are nonfunctional DNA sequences that can accumulate in the genomes of some bacterial species, especially those undergoing processes like niche change, host specialization, or weak selection strength. They may last for long evolutionary periods, opening the question of how the genome prevents expression of these degenerated or disrupted genes that would presumably give rise to malfunctioning proteins. We have investigated ribosomal binding strength at Shine-Dalgarno sequences and thedoi:10.1093/molbev/msi209 pmid:16014873 fatcat:hlokqmxpnrfdjkf4yhzo6k3coi