Available proteins

CHARACTERISTIC	PS-CFP2	KFP-Red	PA-TagRFP
* Brightness is a product of extinction coefficient and quantum yield, divided by 1000. Ext.coeff. – extinction coefficient.
Fluorescence color	cyan   /   green	NO   /   red	NO   /   red
Excitation max (nm)	400   /   490	580   /   580	-   /   562
Emission max (nm)	468   /   511	600   /   600	-   /   595
Quantum yield	0.20   /   0.23	<0.001   /   0.07	nd   /   0.38
Ext. coeff. (M-1cm-1)	43 000   /   47 000	123 000   /   59 000	nd   /   66 000
Brightness*	8.6   /   10.8	0   /   4.1	0   /   25.1
Activating light	UV-violet (e.g. 405 nm)	green (530-560 nm)	UV-violet (e.g. 390-420 nm)
Calculated contrast, fold	up to 2000	35-70	~540
Structure	monomer	tetramer	monomer
Cell toxicity	not observed	not observed	not observed
Aggregation	no	no	no
Maturation rate at 37°C	fast	medium	fast
Molecular weight (kDa)	27	26	27