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IS30 is an insertion element common in E. coli strains but rare or absent in Salmonella. Transfer of the IS30-flanked transposon Tn2700 to Salmonella typhimurium was assayed using standard delivery procedures of bacterial genetics (conjugation and transduction). Tn2700 'hops' were rare and required transposase overproduction, suggesting the existence of host constraints for IS30 activity. Sequencing...