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Phase-contrast micrographs showing typical cell morphologies of the predominant bacteria in hot spring microbial mats. (A) Sulfur-turf mat (YUM-2). (B) Chloroflexus-mixed mat (NAK-2). (C) Cyanobacterial mat (NAK-3). (D) Purple photosynthetic mat (NIK-3). Bars = 10 μm.
