We now show that a bacteriophytochrome from Deinococcus radiodurans, incorporating biliverdin as the chromophore, can be engineered into monomeric, infrared - fluorescent proteins (IFPs), with excitation and emission maxima of 684 and 708 nm, respectively; extinction coefficient > 90,000 M − 1 cm − 1; and quantum yield of 0.07. (science.sciencemag.org)
Now Shu et al. (p. 804) have engineered a bacteriophytochrome from Deinococcus radiodurans that incorporates biliverdin as the chromophore, to fluoresce with excitation and emission spectra of 648 and 708 nanometers, respectively. (science.sciencemag.org)
The rest of the hemoglobin is decomposed into a green pigment called biliverdin, then converted to bilirubin, which is yellow or light brown. (discovermagazine.com)