Contents

23 January 2009
Vol 323, Issue 5913

About The Cover

Cover image expansion

COVER Human cells infected with the protozoan parasite Toxoplasma gondii visualized by scanning electron microscopy. In the foreground are parasites (yellow-green) rupturing out of a dying host cell (blue); in the background is an intact host cell containing a large parasite-filled vacuole. See page 530) Image: Sasha Meshinchi, Michael Robinson, Bjorn Kafsack, and Vern Carruthers