DNA's phosphate backbone gives it a net negative charge, so it migrates towards the positive anode when you run a current. But honestly, in my lab here, what really 'moves' is my frustration when the power flickers and ruins a run. I've seen gels where the bands went sideways because of a voltage drop during a Bengaluru evening load-shedding. So, while the theory is solid, in practice, DNA sometimes just moves towards the nearest power backup.
#travel
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