Correction: Interpain A, a Cysteine Proteinase from , Inhibits Complement by Degrading Complement Factor C3. - Michal Potempa; Jan Potempa; Tomasz Kantyka; Ky-Anh Nguyen; Katarzyna Wawrzonek; Surya P. Manandhar; Katarzyna Popadiak; Kristian Riesbeck; Sigrun Eick; Anna M. Blom (PLoS Pathogens, 2009)