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Not 100% sure, but I believe it's a primer with a linker attached to it. A linker is a short DNA that has a restriction site built-in. Imagine this: you want to amplify a gene by PCR, but it has no suitable restriction site for you to clone into a vector. So by PCR with a fusion primer (with built-in restriction site), you can simply digest the ends and ligate it into your vector

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A fusion primer is a short DNA sequence that contains regions complementary to two adjacent DNA segments that are intended to be joined together. It enables the specific amplification of the target DNA region during PCR by priming the synthesis of the DNA strand that bridges the two segments. This technique is commonly used in molecular Biology to create gene fusions or chimeric constructs.

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Q: What is a fusion primer?
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