期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 97, 期 9, 页码 4453-4456出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.97.9.4453
关键词
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DNA sequence analysis dictates new interpretation of phylogenic trees. Taxa that were once thought to represent successive grades of complexity at the base of the metazoan tree are being displaced to much higher positions inside the tree. This leaves no evolutionary intermediates and forces us to rethink the genesis of bilaterian complexity.
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