Fig. 4

Comparison between Greengenes and HITdb using data from biological samples. The used data set is indicated in rows, and relative and absolute numbers of assignments at genus and species levels in columns. At species level, the results for HITdb additionally show the biological species only (i.e. without OTUs) for easier comparison with Greengenes. ***p < 0.001. n = 119 and n = 40 samples for 454 and Illumina data sets, respectively