Cover photograph (Copyright © 1999, American Society for Microbiology. All rights reserved.): Radially colored, shaded surface representation of shell protein densities of herpes simplex virus type 1 VP26 and VP5-VP19C particles shown in half. The VP26 capsid (left) is a T=16 particle of 1,250 Å in diameter and VP5-VP19C (right) is a T=7 particle of 880 Å in diameter. (See related article in the August 1999 issue: vol. 73, p. 6821.)