© 2013 H. L. Vasaly et al. CBE—Life Sciences Education © 2013 The American Society for Cell Biology. This article is distributed by The American Society for Cell Biology under license from the author(s). It is available to the public under an Attribution–Noncommercial–Share Alike 3.0 Unported Creative Commons License (http://creativecommons.org/licenses/by-nc-sa/3.0).

ACKNOWLEDGMENTS

We thank Terry Woodin and Jason Feser for assistance and for comments on the manuscript. We thank Sarah Elgin for her insightful and quick editing.

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