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Relative abundances of V3V4 and V4 sequenced negative controls, DNA/RNA shield fluid (D), OMNIgeneGUT (O), Lysis Buffer 1 as extraction controls (EC), and PCR blanks (PCR0). Extraction groups are indicated with numbers 1–4. Numbers after the underscore are reads in OTUs. Colored circles indicate the quantity of reads in OTUs (green < 10,000, yellow 10,000–100,000, red > 100,000).
