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a and d; AFM micrographs of the organic matrix associated with the valves and the girdle bands respectively. b and c; SEM micrographs of the proximal and distal surface of the valve respectively (scale bar 1 µm). e; AFM micrograph of a silicified girdle band. AFM scan sizes are 3.6, 10, and 10.6 µm for a, d, and e respectively).
