Transcription levels of fumC, gldA, and mdh relative to those of the corresponding genes in Propionibacterium jensenii ATCC 4868. The total RNA extracted from cells was reverse transcribed to cDNA. The obtained cDNA was subjected to quantitative PCR, and fumC, gldA, and mdh in the wild type were set as the guide sample. Light gray bars, fumC; gray bars, gldA; dark gray bars, mdh.