FusionRed is a red fluorescent protein characterized by improved performance in fusions and low toxicity [Shemiakina et al., 2012]. FusionRed lacks the residual tendency of other monomeric RFPs to dimerize at high concentration and behaves as a pure monomer at concentrations up to 10 mg/ml in HPLC analysis. Such "supermonomeric" properties ensure superior efficiency of FusionRed in protein labeling applications, especially in the cells with high expression level.

Similarly to parental mKate2, FusionRed demonstrates fast maturation rate, high pH-stability and photostability, and significantly lower cytotoxicity than widely used mCherry [Shaner et al., 2004] and mRuby [Kredel et al., 2009].

FusionRed is mainly intended for protein labeling and long-term experiments including generation of transgenic animals.