An object of the present invention is to provide a safer double-stranded DNA labeling technique. The present invention provides a fusion protein, wherein the fusion protein comprises a double-stranded DNA binding protein and a fluorescent protein, The method of claim 1, wherein the double-stranded DNA binding protein is P39476, F4B8X5, A0A125SJ97, or Q96X56. A fusion protein is provided. Figure 1

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