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Contaminating species identified from the three metagenomic datasets by Meta-QC-Chain Human was identified as the largest contaminating species in real sequenced human saliva datasets R1 (A) and R2 (B). Chlorophyta algae species were identified as possible contaminations in simulated dataset S1 (C). “1 more” or “11 more” means more species identified with very low proportion of 18S rRNAs, which can be neglected here.
