http://digfir-published.macmillanusa.com/lodish_animation/a0301_protein_structure.html\tChapter 3. Oil Drop Model of Protein Structure
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http://digfir-published.macmillanusa.com/lodish_animation/a0301_protein_structure_dlap.xml\tDLAP questions\t519bca41b11c0f1368000044