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Representative cyanobacteria from Niuafo‘ou stromatolites. (A and B) SEM images of a living cyanobacterial mat composed of filaments (A) and coccoids (B) covering the mat surface. Optical images: (C) Myxosarcina-like coccoidal cyanobacteria partly silicified. (D) Almost perfectly preserved silicified filamentous cyanobacterium with thick mucilage sheaths.
