Figure S1.Scanning EM of the Pf-IRBC surface showing presence of knobs (JPG, 776 KB) - The scale bar is 1 micron and a single uninfected erythrocyte is shown in the center. Methods:Percoll purified unselected 3D7 were washed in PBS and spun gently on to polylysine 5 mm silica chips(Ted Pella, cat #16008). Chips were then stained with 2% uranyl acetate for 3060 min. After one quick rinse with 50% ethanol, chips were rinsed consecutively in 50, 70, and 90% ethanol for 3 min each, followed by three rinses in 100% ethanol for 3 min each. After critical point drying for 12 h, chips were coated with chromium. Silica chips loaded with samples were ready for FEISEM (LEO 1550).