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Bacterial biofilms form segments (green) as they grow, similar to vertebrates during development. Time lapse movie (left) and maximum projection (right) of a Bacillus subtilis biofilm. Green color indicates nitrogen stress response as reported by PnasA-yfp. Fluorescence images were overlaid on the corresponding brightfield images. Scale bar, 1 mm.
Credit: Kwang-Tao Chou
