source: [lemma=mutant] [lemma=that] [□=□] □
destination: [lemma=mutant] [lemma=that] [lemma=□] □
spec: He succeeded his father , Cunomor , in the early 5th century . Certain `` room for improvement '' items grabbed our attention without much effort . To better understand the molecular basis for its ability to resist host defense we characterize Mtb mutants that are susceptible to stresses likely encountered by the bacterium during persistence within the host . Using genetic approaches we have identified Mtb mutants that are hyper susceptible to such stress conditions .