Fig. 1.
Structure of lutein. 3-D structure (PDF file of a light harvesting protein with bound lutein downloaded from Protein data bank (http://www.pdb.org/pdb/home/home.do). Using Swiss-Pro/PDB viewer the light harvesting protein was turned off to expose lutein. 3-D structure of lutein can also be viewed on http://www.worldofmolecules.com/3D/lutein_3d.htm. Fundamental chemical structure (Inset) reproduced from http://www.chm.bris.ac.uk/motm/carotenoids/carotenoids.htm with permission and modified as warranted.