Isolated fluorescent protein from clytia gregaria cgfp and use thereof

Nucleic acid molecule, selected from the group consisting of

• a) nucleic acid molecules encoding the polypeptide disclosed by SEQ ID NO:
• 2;
• b) nucleic acid molecules containing the sequence depicted by SEQ ID NO:
• 1;
• c) nucleic acid molecules whose complementary strand hybridizes under stringent conditions with a nucleic acid molecule of a) or b) and which have the biological function of a fluorescent protein;
• d) nucleic acid molecules which differ from those mentioned under c) due to the degeneracy of the genetic code;
• e) nucleic acid molecules whose sequences are at least 95% homologous to SEQ ID NO:
• 1 and which have the biological function of a fluorescent protein;
• and
• f) nucleic acid molecules whose sequences are at least 65% homologous to SEQ ID NO:
• 1 and which have the biological function of a fluorescent protein.