Release 226.0:
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GTDB release R10-RS226 comprises 732,475 genomes organised into 143,614 species clusters.
Additional statistics for this release are available on the GTDB Statistics page.

Release notes:
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- Post-curation cycle, we identified updated spelling for 1 taxon and a valid name for a placeholder:
	g__Prometheoarchaeum (updated name: Promethearchaeum)
	f__MK-D1 (updated name: Promethearchaeaceae)
  Note that the LPSN linkouts point to the correct updated names. We encourage users to use 
  the updated names as these will appear in the next release.

- QC criteria for GTDB was modified to consider CheckM v1 and v2 completeness
  and contamination estimates. In order to pass QC, a genome must have completeness
  >=50%, contamination <5%, and quality (completeness - 5*contamination)
  >=50% using both the CheckM v1 and v2 estimates. The exception is that a contig
  comprised of <10 contigs passes QC if these criteria are meet be either CheckM v1 or v2.
  
- Mash is no longer used as a prefilter for establishing GTDB species clusters
  as this was found to be unnecessary with the prefiltering provided internally
  by skani (Shaw et al., Nat Methods, 2023).
 
- The 20% most heterogeneous sites were removed from the archaeal MSA using alignment_pruner.pl
  (https://github.com/novigit/broCode/blob/master/alignment_pruner.pl).

- The GTDB taxonomy tree now provides links to Sandpiper (https://sandpiper.qut.edu.au) results
  which provide information about the geographic and environmental distribution of a taxon.
  
- We thank Jan Mares for his assistance in curating the class Cyanobacteriia, 
  Peter Golyshin for bringing Ferroplasma acidiphilum strain Y (GCF_002078355.1) to our attention,
  and Brian Kemish for providing IT support to the project.