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Relative effects of deletion of pspX and pspR on psp gene expression measured by qRT-PCR analysis. cDNA was synthesized from RNA extracted from P. alba wild type, M1303 (pspX), and M1308 (pspR) after 162 h of culture. psp gene expression was normalized to that of the putative hrdB homolog of P. alba and expressed as a percentage of wild-type gene expression. Error bars depict SD between three technical replicates.
