Table 1. Photophysical parameters of FPs that affect the FRET efficiency and photostability.

	Ex λ(nm)	Em λ(nm)	ε(mM−1cm−1)	Q	Photostability (s)	Ref
mCerulean	433	475	43	0.62	36	36
mTurqoise2	434	474	30	0.93	90	37
CyPet	435	477	35	0.51	59	29
mTFP1	462	488	64	0.85	110	38
mCitrine	516	530	77	0.76	49	39
YPet	517	530	104	0.77	49	29
TagRFP	555	584	100	0.48	37	40
TagRFP-t	555	584	81	0.41	337	41
mRuby2	559	600	113	0.38	123	42
mCherry	587	610	72	0.22	96	43