© 2018 K. P. Kohn et al. CBE—Life Sciences Education © 2018 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).

We thank Cori Fata-Hartley and Tammy Long for very helpful discussions. This work was supported in part by the Association of American Universities (AAU) Undergraduate STEM Education Initiative, funded by the Helmsley Charitable Trust, and by the National Science Foundation under DUE 0816692 (1359818). Any opinions, findings, conclusions, or recommendations expressed here are those of the authors and do not necessarily reflect the views of the National Science Foundation.

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