Contact: Denise Brehm
Massachusetts Institute of Technology, Department of Civil and Environmental Engineering
Caption: The figure shows the evolution of gene families in ancient genomes across the Tree of Life. The sizes of the little pie charts scale with the number of evolutionary events in lineages, slices indicate event types: gene birth (red), duplication (blue), horizontal gene transfer (green), and loss (yellow). The Archean Expansion period (3.33 to 2.85 billion years ago) is highlighted in green.
Credit: Lawrence David
Usage Restrictions: With credit
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