ACKNOWLEDGEMENT
This work was funded by the DOE Center for Advanced Bioenergy and Bioproducts Innovation (U.S. Department of Energy, Office of Science, Office of Biological and Environmental Research under Award Number DE-SC0018420). Any opinions, findings, and conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the U.S. Department of Energy. The authors would like to thank Dr. Rene Verwaal in Nertherland and Dr. Guo-liang Yan in China for kindly providing the plasmid YIplac211YB/I/E*. The authors also thank Dr. John W. Erdman and Molly Black in the University of Illinois for their earnest help with the carotenoids chromatography.