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. 2007 Dec 28;3(12):e253. doi: 10.1371/journal.pcbi.0030253

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Older A⁻S⁺ swarms stop expanding when their edge becomes smooth and many layers deep. The white scale bar is 50 μm long.