Fluorescent protein and gene encoding the same

A fluorescent protein from a copepod taxonomically classified to Chiridius Poppei, comprising the full-length amino acid sequence of SEQ ID No:

• 1, the fluorescent protein being recombinantly expressed,
• wherein the fluorescent protein has a fluorescence spectrum having a maximum peak with a wavelength of 518 nm and an excitation spectrum having a maximum peak of wavelength of 507 nm,
• wherein a fluorescence performance of the fluorescent protein is due to the fluorescent core of the fluorescent protein, which fluorescent core is post-translationally formed from G55Y56G57 tripeptide site in SEQ ID NO:
• 1 through cyclization and subsequent oxidation.