Table of Contents

10 February 2012
Vol 335, Issue 6069

About The Cover

Cover image expansion

COVER Colorized scanning electron micrograph of a blood clot, removed from the coronary artery of a patient with acute myocardial infarction, showing the fibrin meshwork (brown) with trapped red blood cells (average ~7 micrometers across) and a cholesterol crystal (yellow). Regulated clotting of blood is essential for preserving life in vertebrates. The Gordon Research Conference on Hemostasis will be held 22 to 27 July 2012 in Waterville Valley, New Hampshire. See page 728 for the conference schedule and preliminary programs. Image: Chandrasekaran Nagaswami and John W. Weisel, University of Pennsylvania