The ribosomal and tRNA genes were retrieved from the ucsc table browser:


Select "All Tables" from the group drop-down list
Select the "rmsk" table from the table drop-down list
Choose "GTF" as the output format
Type a filename in "output file" so your browser downloads the result
Click "create" next to filter
Next to "repClass," type rRNA
Next to free-form query, select "OR" and type repClass = "tRNA"
Click submit on that page, then get output on the main page
