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Changes of OTU abundance in mock community samples upon serial dilutions. Relative OTU abundance obtained from amplified 16S rRNA gene sequencing from mock communities processed by a BDA or b after NDA extraction decreased for most mock community strains but increased for S. epidermidis. p values were calculated using Wilcoxon-Mann-Whitney test. * p ≤ 0.05, ** p ≤ 0.01, *** p ≤ 0.001
