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Transcriptional expressions of the seven genes in Lactobacillus bulgaricus cells after cultivation at the initial pH of 5.6 and 6.5 for 12 h by real-time PCR analysis
(a) OppD; (b) PrtB; (c) PepC; (d) PepF; (e) PepQ; (f) PepX; (g) PepT. 16S rRNA was used as an internal control. Data are expressed as mean±SD of triplicates
