Balvociute M, Huson D. SILVA, RDP, Greengenes, NCBI and OTT - how do these taxonomies compare?. BMC Genomics. 2017;18:114 pubmed publisher
..While we find that SILVA, RDP and Greengenes map well into NCBI, and all four map well into the OTT, mapping the two larger taxonomies on to the smaller ones is problematic. ..