May 2013
    Release 13_5
    Covers 1.25 million sequences
    Chimera checking simplified
November 2013
    Release 13_11
    Beta-testing community driven taxonomy curation
    Greengenes workflow streamlined to automatically obtain and process newly deposited sequences
    Preliminary 18S release
May 2014
    Community driven taxonomy curation in effect
    Refine the Eukaryota taxonomy
    Initial multi-locus phylogeny adoption to support stable groups