Cover photo courtesy of Goldstein et al, "Induction of HL60 Cell Differentiation by Tiazofurin and Its Analogues: Characterization and Efficacy," p 593. Computer graphics rendering of the tiazofurin molecule. Atoms are drawn at their van der Wall's radii and are color-coded according to type (blue, nitrogen; red, oxygen; light blue, carbon; white, hydrogen; yellow, sulfur). Coordinates are from the crystallographic study by Goldstein et al (J Am Chem Soc 105:7416, 1983).