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Strains lacking cytochrome bd-I (cydB) and lacking the CydDC transporter (cydD) were grown alongside the isogenic wild-type strain and assessed for their ability to grow in the presence of various concentrations of the NO donor NOC-12. Although both mutant strains exhibit sensitivity to NO, growth of the cydD strain was impaired to a greater extent compared to the cydB strain at all concentrations of NOC-12.
