1 Department of Life Sciences, Imperial College London, Sir Alexander Fleming Building, South Kensington, London SW72AZ, United Kingdom. Electronic address: jake.baum@imperial.ac.uk.
2 Integrative Parasitology, Center for Infectious Diseases, University of Heidelberg Medical School, Im Neuenheimer Feld 324, 69120 Heidelberg, Germany. Electronic address: freddy.frischknecht@med.uni-heidelberg.de.