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Composite B. subtilis gene expression array images for A-72310 (128 μg/ml), clarithromycin (10 μg/ml), tetracycline (0.1 μg/ml), and ciprofloxacin (0.1 μg/ml). Drug-induced changes in mRNA concentration are indicated by either light (upregulated), dark (downregulated), or neutral gray (unchanged) spots (in duplicate).
