Fluorescent proteins.

<p>A) Body plan of fluorescent proteins. DarkCitrine is fused to the N terminus of TFP and Citrine with a GSGG linker (black bar). B) Emission spectra from yeast expressing each XFP excited by a 458 nm laser and emission collected from 460–650 nm. (Double-headed arrows indicate wavelength bands used in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0109940#pone-0109940-g002" target="_blank">Figure 2</a>)