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Principal coordinates analysis (PCoA) based on the total operational taxonomic units (OTUs). PCoA after fermentation for (A) 16, (B) 32, and (C) 48 h. SDF 0% means SDF/IDF = 0:1; SDF 25% means SDF/IDF = 1:3; SDF 50% means SDF/IDF = 1:1; SDF 75% means SDF/IDF = 3:1; and SDF 100% means SDF/IDF = 1:0.
