Kaede corresponds to a naturally occurring green-to-red photoconvertible fluorescent protein isolated from Trachyphyllia geoffroyi. It is a tetrameric protein that can be irreversibly photoconverted from an initial green fluorescent form to a red fluorescent form, upon irradiation with UV or violet light (350-400nm). The green fluorescent form has an excitation peak of 508nm and an emission peak of 518nm, while the red fluorescent form has an excitation peak of 572nm and an emission peak of 582nm in vitro (PMID:12271129).