Provided are photosensitizing proteins and the like that form a conformation in a shorter time than before. A protein having the amino acid sequence set forth in SEQ ID no:9, or a protein having 90 or more homology to SEQ ID no:9 and having photosensitization. At this time, it is preferable to provide a fusion protein obtained by fusing the protein with an intracellular signal protein. Figure 6

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