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Transcriptional analysis of bhbA (A, blue), bhbA2 (A, orange), bhbB (B, blue), and bhbB2 (B, orange) in Comamonas sp. strain 7D-2 in response to different substrates. The levels of gene expression in each sample were calculated as the fold expression ratio after normalization to the trfA gene transcriptional levels. The error bars indicate standard deviations.
