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Transcriptional level of several cell wall-related genes. Comparison of the relative transcription levels of several cell wall biosynthesis- and hydrolysis-related genes in the wild-type, the airSR mutant, and the airSR complementary strains. (a), (b), and (c) transcriptional levels under aerobic conditions in different time courses; (d) transcriptional levels under anaerobic conditions. (*indicates P < 0.05; **indicates P < 0.01).
