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A few baseline ideas should be understood. 1. The assumption is made that Meselson and Stahl's cell line at the start of the experiment contains DNA composed entirely of the $N_{15}$ isotope. 2. DNA with a greater proportion of $N_{15}$ isotope is denser than DNA with lesser proportion of $N_{15}$ isotope. 3. Higher density DNA sinks lower in the test tube ...

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