mEos3.2 is a monomeric fluorescent protein that can be irreversibly photoconverted from an initial green fluorescent form to a red fluorescent form upon UV irradiation. The green fluorescent form has an excitation peak of 507nm and an emission peak of 516nm, while the red fluorescent form has an excitation peak of 572nm and an emission peak of 580nm in vitro. mEos3.2 is an artificial derivative of the naturally occurring fluorescent protein encoded by the Lobophyllia hemprichii EosFP gene (GenBank:AY765217). It is truly monomeric, brighter, matures faster and exhibits higher photon budget and label density than mEos2. It contains the mutations I102N, H158E and Y189A relative to mEos2 (PMID:22581370).