http://digfir-published.macmillanusa.com/lodish_animation/a1203_atp_synthesis.html\tChapter 12. ATP Synthesis
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http://digfir-published.macmillanusa.com/lodish_animation/a1203_atp_synthesis_dlap.xml\tDLAP questions\t519bca42b11c0f1368000086