Sickle red cell entrapment in a blood clot. In this scanning electron micrograph, Faes and colleagues show entrapped sickled red cells in an experimentally induced, fatal inferior vena cava blood clot in a sickle cell mouse. The acellular material appears in other images to be a dense fibrin network. Original magnification ×5000. SS, sickle cell. See Figure 1B in the article by Faes et al that begins on page 2529.