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Molecular Evolution

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chimpanzee and human

THE DIFFERENCE  Humans and chimpanzees are easy to tell apart, even though they share a primate ancestor. Jumping genes helped sculpt their distinctions.

phages

WEAPONS OF MASS EVOLUTION  Bacteria and archaea armed with CRISPR systems have been at war with viruses for eons. Here, hordes of viruses known as phages assault a bacterium to turn it into a virus-making factory.

adenylate kinase enzyme bond

HOT AND COLD Scientists reconstructed three billion years of genetic history for the adenylate kinase enzyme (shown here bound to another molecule) to see how ancient enzymes might have adapted to a cooler Earth.

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