http://digfir-published.macmillanusa.com/life_11e_animation/life_animation_16_02.html
Chapter
1. The trp Operon
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http://digfir-published.macmillanusa.com/life_11e_animation/life_animation_16_02_dlap.xmlDLAP questions57e41265757a2e6d1b000004