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Effect on silica morphology of combining N. angularis polyamines and silaffins. For precipitation in A, enriched silaffins (see brackets in Fig. 1, lane 2) at a concentration of 3 mg/ml were used and in B, a mixture of silaffins (3 mg/ml) and polyamines (0.85 mg/ml) was used. (Insets) Larger views of the precipitates. [Scale bars, 500 nm, 1 μm (Insets).]
