https://dl.dropboxusercontent.com/u/2868868/emp/2014.01.17/emp-cr.biom.gz
https://dl.dropboxusercontent.com/u/2868868/emp/2014.01.17/emp-or.biom.gz
https://dl.dropboxusercontent.com/u/2868868/emp/2014.01.17/emp-or.tre.gz
https://dl.dropboxusercontent.com/u/2868868/emp/2014.01.17/refseqs.fna.gz