The Acknowledgments section should read as follows. ACKNOWLEDGMENTS The Australian Research Council’s Discovery, Future Fellowship and Linkage Programs are acknowledged by S.P. and T.M. for funding, J.M. acknowledges the Henry Bertie & Florence Mabel Gritton Scholarship, The O’Donnell Young Scientist Prize, and CSIRO PhD studentship. The authors acknowledge Mr. Yun Huang for his help with the preparation of the SiP-RAFT particles and Dr. Binh Pham and A/Prof Brian Hawkett of the University of Sydney for incubating the particles and obtaining confocal microscopy images. Sirtex Medical is acknowledged for financial support for the cell imaging work.The authors acknowledge the facilities, and the scientific and technical assistance, of the Australian Microscopy & Micro-analysis Research Facility at the University of Sydney.