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. 2011 Sep 20;6(9):e25272. doi: 10.1371/journal.pone.0025272

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Matsunaga 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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Sample sonograms of song sequences of pre- and post-Cad7GFP virus-injected birds and scatterplots of 3,000 song notes (duration versus Wiener entropy).