RT-PCR of genes differentially expressed between wild-type (WT) X. fastidiosa and the algU::nptII mutant. rRNAs were detected in the algU::nptII mutant and the wild type in this RT-PCR condition. The algU, algC, algS, algR, algH, mucD, ompW, and cvaC (PD0216) RNAs were decreased in the mutant compared to the wild type, and the PD0521 and PD1295 RNAs were slightly increased in the algU::nptII mutant.