Figure 372 from Chapter 15 (Cytoplasmic Inclusions) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. In the tapetum lucidum of a cat's eye, the cytoplasm of cells is filled with highly ordered rod-like crystals containing a compound rich in zinc and cysteine. Mitochondria and other organelles are displaced to the periphery of the cell. At the lower right are portions of two melanin-containing pigment cells. Image by Giuseppina Raviola. A PDF copy of the accompanying chapter is available on the ASCB’s BioEDUCATE website.