|EC (M-1 cm-1)
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AvicFP3 is highly homologous to AvicFP2 (96% amino acid identity), and is similarly green fluorescent when expressed and purified in the dark. Like AvicFP2, AvicFP3 converts to a green-absorbing chromoprotein when exposed to blue light. We suspect that AvicFP3 is so highly sensitive to blue light exposure that the act of taking an absorbance measurement is enough to partially photoconvert the protein.