Fig. 1From: Improved taxonomic assignment of human intestinal 16S rRNA sequences by a dedicated reference databaseMain steps in the construction of the human intestinal tract 16S taxonomic database (HITdb). Human intestinal specific sequences were pulled down from the Greengenes and Silva databases using Genbank sequences. Obtained sequence data were clustered at 97 % identity by using cultivable human intestinal species as a reference. A cultivable nearest neighbour was determined for each OTU. The taxonomic lineages were determined based cultivable species taxonomy, Greengenes and manual curatingBack to article page