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SCFP3A is a basic (constitutively fluorescent) cyan fluorescent protein published in 2006, derived from Aequorea victoria. It is reported to be a very rapidly-maturing monomer with low acid sensitivity.
We created monomeric optimized variants of ECFP and EYFP, which fold faster and more efficiently at 37°C and have superior solubility and brightness. Bacteria expressing SCFP3A were 9-fold brighter than
those expressing ECFP and 1.2-fold brighter than bacteria expressing Cerulean. In HeLa cells,
the improvements were less pronounced; nonetheless, cells expressing SCFP3A and SYFP2 were both
1.5-fold brighter than cells expressing ECFP and EYFP(Q69K), respectively.