Endonucleases are enyzmes (usually derived from bacterial sources) which cleave DNA at defined "restriction" sites.

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What are common causes of unexpected ligation products?

I digested two plasmids, one with EcoRI and AgeI and the other with EcoRI and XmaI. Digests looked as expected, so I purified the respective fragments and set up the T4 DNA ligation (AgeI and XmaI ...