Protein power.

Abstract

IL L U S T R A T IO N : D A N IE L E S K R ID G E / S T O C K T R E K I M A G E S / C O R B IS W hile working out his theory of evolution, Charles Darwin was flummoxed by fossils of a pair of bizarre, extinct animals from South America. The horse-sized Macrauchenia looked like a cross between a camel and an elephant; Toxodon resembled a rhinoceros with the… (More)
DOI: 10.1126/science.349.6246.372

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