A Ruby API to query the Ensembl database for genomic features1 INTRODUCTION The Ensembl (Flicek et al., 2010) and UCSC (Fujita et al., 2010) genome browsers are the first point of call for a large community of genetics and genomics researchers. Both provide a graphical interface for browsing the genomes of a large number of species, displaying the location of genes, polymorphisms, repeats and regulatory regions. Each database can also be accessed directly v
