Figures 289 (upper) and 290 (lower) from Chapter 9 (Peroxisomes) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. Peroxisomes from cells of the proximal convoluted tubule of rat kidney. The peroxisome in the upper panel contains crystals, whereas the one in the lower panel contains cylindrical inclusions, apparent in this transverse section. Images courtesy of Michael Barrett and Paul Heidger (1975) Cell and Tissue 157:283-305, PMID: 1122543. A PDF copy of the accompanying chapter is available on the ASCB’s BioEDUCATE website.