June 30, 2010
* First stand alone release

March 7, 2011
* 2.0.1 release
* Maximum number of input sequences was increased to 15999.
* Improvements to reduce time for pre-alignment sequence clustering.
* Added limit on number of domain hits per input sequence that can
  be set with the -num_domain_hits option.

June 13, 2013
2.0.2 release
New features:
* Align two multiple sequence alignments
* Use pre-computed CDD search results in BLAST archive format
Improvements:
* BLAST+ 2.2.28
Bug fixes:
* Nexus alignment format
* Segmentation fault on out-of-memory
* Alignment problems with clustering input sequences

January 31, 2017
2.1.0 release
Improvements:
* More memory efficient sequence clustering
* No longer prints warning message about all sequences in one cluster
Bug fixes:
* Fixed clustering results for sequences with ambiguous amino acids
