It is intended to provide a PCR primer capable of immobilizing a double-stranded PCR amplified product on an array as such without heat-melting and to provide a simple PCR method using the primer and an technique for immobilizing a protein on a PCR amplified product obtained by the method or on a PCR amplified product immobilized on the array. The PCR primer according to the invention is a PCR primer in which a tag region that is not involved in the PCR reaction is present at the 5’ end side of the main body of the primer comprising a natural type DNA chain which can be a template in the PCR method.
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