SNPs and other polymorphisms are important genomic features and we often want to retrieve known SNPs in particular genomic regions. Here, we'll look at doing that in two different BioMarts that hold different types of data for their SNPs. In the first part, we'll use Gramene again to look at retrieving plant SNPs. In the second part, we'll look at how to find information on human SNPs in the main Ensembl database.