Ancient Teeth – Northeast Brazil Samples (IMAGE) Florida Atlantic University Caption Researchers used teeth from ancient samples collected in archeological sites in northeast Brazil. Teeth are especially important in ancient DNA analysis because of the excellent preservation of biomaterials within the tooth. Credit Laboratório de Arqueologia Biológica e Forense, Universidade Federal de Pernambuco Usage Restrictions Credit: Laboratório de Arqueologia Biológica e Forense, Universidade Federal de Pernambuco License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.