The oldest genetic data from a human relative has been found in 2-million-year-old teeth
Proteins tend to be more resilient than DNA, allowing researchers to push the molecular record further back in time.
Around 400 of the same amino acids were sequenced in all four samples.
Other scientists say that the jury is still out on whether ancient proteins will help bring consensus to the picture of hominin evolution, which is currently built largely from the shapes of bones.
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