Available proteins

CHARACTERISTIC	Katushka2S	TurboFP650	NirFP
* Brightness is a product of extinction coefficient and quantum yield, divided by 1000. ** Although NirFP is characterized by fast maturation in E. coli, due to low brightness it requires up to 48 hours for detection after transfection in mammalian cells.
Fluorescence color	far-red	near-infrared	near-infrared
Excitation max (nm)	588	592	605
Emission max (nm)	633	650	670
Quantum yield	0.44	0.24	0.06
Ext. coeff. (M-1cm-1)	67 000	65 000	70 000
Brightness*	29.5	15.6	4.2
Brightness, % of EGFP	89	47	13
pKa	5.4	5.7	4.5
Structure	dimer	dimer	dimer
Cell toxicity	not observed	not observed	not observed
Aggregation	no	no	no
Maturation rate at 37°C	super fast	super fast	fast**
Molecular weight (kDa)	26	26	26