In collaboration with CITIUS (Centro de Investigación, Tecnología e Innovación de la Universidad de Sevilla) we set up a laboratory for the preparation and analysis of tooth enamel samples for amelogenin peptides, a cutting-edge technique that allows the sexing of human skeletons with a high degree of certainty, thus overcoming uncertainties from anthropological analysis based on bone morphology. The application of this new technique to burials from the Valencina Copper Age mega-site has already yielded ground-breaking results.