Vol. 199 No. 3, October 29, 2012. Pages 425–435.

The authors wish to acknowledge additional sources of support. Revised acknowledgment paragraphs appear below.

We thank Dr. Alex Smith for providing access to the FlexCell device and Charles Ferguson and Nicole Schieber for assistance with EM.

This work was supported by grants from the Canadian Institutes for Health Research (MOP-43938 to I.R. Nabi) and Cancer Research Society (to I.R. Nabi), and by a grant and fellowship from the National Health and Medical Research Council of Australia (NHMRC 511005 and 569452 to R.G. Parton).

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