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Relative levels of nrfA, nrfD, and nrfE expression as determined by real-time RT-PCR (normalized with gyrB) during anaerobic growth of P. multocida X-73 and AL362. Cultures of X-73 and AL362 were grown simultaneously in conditions optimal for nitrite reduction. The values are means ± standard deviations for relative expression determined from a minimum of three reactions.
