On average, the proportion of spurious OTUs in both the mock communities and samples from gnotobiotic mice was slightly lower after removing singletons, although this did not reach statistical significance (50.8 vs. 64.3%, p = 0.227; 57.5% vs. 65.7%; p = 0.70, pairwise comparison by t -test, including Benjamini–Hochberg correction following ANOVA).
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Handling of spurious sequences affects the outcome of high-throughput 16S rRNA gene amplicon profiling.
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