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. 2009 Feb 23;4(2):e4568. doi: 10.1371/journal.pone.0004568

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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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a) Two pre-duplication outgroups Y₁ and Y₂. b) The general case for one pre-duplication outgroup Y and one post-duplication outgroup X. c) X and C retain the same duplicate copy. d) X and B retain the same duplicate copy. Red branches indicate the NST internal branch supporting an A+C clade. Blue branches indicate the known non-species tree (KNST) branch, contradicting the known A+B+C group.