Purified nucleic acids, vectors and cells containing a gene cassette encoding at least one modified bioluminescent protein, wherein the modification includes the addition of a peptide sequence. The duration of bioluminescence emitted by the modified bioluminescent protein is shorter than the duration of bioluminescence emitted by an unmodified form of the bioluminescent protein.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH
This invention was made with U.S. government support under grant number ROI 2580 127 awarded by the Department of Energy. The U.S. government may have certain rights in the invention.