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Probably the plasmid is partially uncutted and it is present in his coiled and supercoiled forms. you can add another control as the undigested construct. In addition you can add much more enzyme, change batch of EcoRI and digest overnight with BSA to exclude star activity.

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โˆ™ 10y ago
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Q: The plasmid sample is supposed to contain only the DNA fragmentWhy are there more than one band?
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