Cover photograph (Copyright © 2005, American Society for Microbiology. All Rights Reserved.): Confocal images of human foreskin fibroblast cells infected for 8 hours with Toxoplasma gondii tachyzoites doubly labeled with anti-acetylated histone H4 (green) and anti-inner membrane complex monoclonal antibody 45-15 (red). The picture was made by Isabelle Tardieux (Cochin Institute, Paris, France). (See related article on p. 10301.)