What is the fine-grained topic of the following text: A team of scientists led by Anders Götherström from Stockholm University has utilized the services of the SciLifeLab National Genomic Infrastructure (NGI) to investigate the demographic dynamics in the Pontic-Caspian steppe – stretching from the northern shores of the Black Sea as far east as the Caspian Sea. Only return the topic.
Investigation of demographic dynamics in the Pontic-Caspian steppe by scientists using SciLifeLab National Genomic Infrastructure services.