Dendra is a monomeric fluorescent protein that can be irreversibly photoconverted from an initial green fluorescent form to a red fluorescent form, using activating UV-violet or blue light. The green fluorescent form has an excitation peak of 486nm and an emission peak of 505nm, while the red fluorescent form has an excitation peak of 558nm and an emission peak of 575nm in vitro. It is an artificial derivative of the naturally occurring green fluorescent protein encoded by the Dendronephthya sp. dendGFP gene (PMID:16550175).