We apologize if this was not clear in the original manuscript. In the original Figure 7 legend we wrote “Many PLYD168A rings become detached from the liposomes, probably due to reduced binding affinity, and tend to break into fragments.” At this stage, the rings are of course prepores, and it is these, not the pores, that become detached and break into fragments. In the revised manuscript (subsection “Determinants of lytic activity” paragraph two) and Figure legend, we have clarified this point.