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. 2015 Mar 3;10(3):e0118238. doi: 10.1371/journal.pone.0118238

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© 2015 Feller et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Inline graphic — (a) A sub-graph (in black) in a background of isolated cells. i ₁ is a source while i ₀ is a sink. (b) A directed forest (in black) in a background of isolated cells. i ₁ is a source while i ₀ and i ₂ are sink cells.

Fig 4 — (a) A sub-graph (in black) in a background of isolated cells. i ₁ is a source while i ₀ is a sink. (b) A directed forest (in black) in a background of isolated cells. i ₁ is a source while i ₀ and i ₂ are sink cells.