Molecular clock calibrations and metazoan divergence dates.

Abstract excerpt

It has recently been argued that living metazoans diverged over 800 million years ago, based on evidence from 22 nuclear genes for such a deep divergence between vertebrates and arthropods (Gu 1998). Two "internal" calibration points were used. However, only one fossil divergence date (the mammal-bird split) was directly used to calibrate the molecular clock. The second calibration point (the primate-rodent...

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