August 2012
    Release 12_8 using refactored Greengenes workflow
        Chimera checking using Chimera Slayer and Bellerophon against consensus from 94% OTUs
        2-study heuristic dropped
    Greengenes workflow software placed under the GNU Public license
    > 1 million 16S sequences
    Coordination with Silva for consistant taxon names
February 2013
    Release 13_2
    Targeting 1.5 million 16S sequences
    Beta-testing community driven taxonomy curation
    Greengenes workflow streamlined to automatically obtain and process newly deposited sequences
    Preliminary 18S release
August 2013
    Release 13_8
    Community driven taxonomy curation in effect
    Refine the Eukaryota taxonomy
    Initial multi-locus phylogeny adoption to support stable groups