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SEM images of calcite crystals modified by different proteins. (a) 0.5 μM OC90; (b) 1 μM OC90; (c) 1.59 μM recombinant mouse OPN; (d) 3.82 μM recombinant mouse OPN; (e) 1.02 μM human fetuin A; (f) 2.04 μM human fetuin A. Scale bar: a–c 20 μm; d–f 10 μm.
