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. 2012 Dec 20;7(12):e51000. doi: 10.1371/journal.pone.0051000

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© 2012 Takizawa 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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Each graph shows the response of synaptic maintenance to a fluctuation in a labeled parameter. The horizontal axes in each graph show a ratio of fluctuation in a labeled parameter. The vertical axes in each graph show the relative number of synapse at 14 days after the first stimulation. The line color indicates the length of intervals between each stimulation: Red: 180 min; Green: 360 min; Blue: 1440 min; and Purple: 2880 min.