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The π-A isotherms for monolayers of all proteins recalculated for area per one amino acid residue of each protein: SP-B-1 (closed circles) and SP-C-1 (open circles) were obtained from butanol extracts; SP-B-2 (closed squares), SP-C-2 (open squares), SP-B-3 (closed triangles), and SP-C-3 (open triangles) were obtained from chloroform/methanol extracts. For better comparison, the conventional π-A isotherms (inset) are shown.
