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##Bioinformatic Analysis  Demultiplex, QIIME, blah,blah, blah  ###Sequence Pre-processing ###OTU assignment and QC  The number of high-quality sequences per sample ranged from 26830 to 77845 (see Table X). The pick\_open\_reference\_otus.py script was used to cluster sequences at 97% similarity. Taxonomy was assigned to each cluster by comparing a representative sequence from each cluster to the gg\_13\_8\_otus reference taxonomy provided by the Greengenes Database Consortium (http://greengenes.secondgenome.com.) No chimeric sequences were identified using the identify\_chimeric\_seqs.py script and there were no singleton OTUs (probably should verify these things). All subsequent beta diversity analyses (comparisons across samples) were performed with all samples rarefied to 26830 sequences per sample.  ###Comparison of ISS surfaces to analogous surfaces in homes on Earth