http://digfir-published.macmillanusa.com/lodish_animation/a0406_bidirectional_repl.htmlChapter 4. Bidirectional Replication of DNA
519bca41b11c0f136800005a
http://digfir-published.macmillanusa.com/lodish_animation/a0406_bidirectional_repl_dlap.xmlDLAP questions519bca41b11c0f136800005a