http://digfir-published.macmillanusa.com/lodish_animation/a0502_plasmid_cloning.htmlChapter 5. Plasmid Cloning
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http://digfir-published.macmillanusa.com/lodish_animation/a0502_plasmid_cloning_dlap.xmlDLAP questions519bca41b11c0f1368000064