12 November 2015
Scientists have unravelled part of the genetic code of a child who was sacrificed in a ritual ceremony by the Inca civilisation 500 years ago.
The boy's mummified remains were discovered on an Argentinean mountain.
Analysis of his mitochondrial DNA, which is passed from mother to child, showed that the boy's closest living relatives are in Peru and Bolivia.
He belonged to a population of native South Americans that almost disappeared after the Spanish conquest.
Researchers in Spain were given permission to extract mitochondrial DNA from the seven-year-old boy to study part of his genome.
By comparing his genetic code with hundreds of thousands of samples held in genetic databases, they found his genetic profile was very rare.