Fig. 3. The effect of specific ions on the proteins in the adhesive gel from A. subfuscus. The same amount of dissolved glue was initially present in each sample. From left to right, the lanes had either 10 mmol l^–1 FeCl₃, 1 mmol l^–1 EDTA, 10 mmol l^–1 MgCl₂, 10 mmol l^–1 CaCl₂ or no extra ions added. Molecular masses are indicated in the left margin.