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. 2017 Nov 17;5:69. doi: 10.3389/fbioe.2017.00069

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Copyright © 2017 Thomas and Willerth.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Representative images of cell growth in (A) the permissive region (puramatrix/agarose) versus (B) PEG after 48 hours. Live cells are labelled with calcein (green) while dead cells are labeled with ethidium homodimer-1 (red). Reprinted from Curley et al. (2011) under a Creative Commons License 3.0.