FN1 and colorectal carcinoma: Firstly, the Venn diagram showed that the number of operational taxonomic units (OTUs) unique to each group of bacteria (Fig. 6a, left) was much larger than the number of OTUs shared between groups, indicating that the composition of the microbiota differed at the OTU level between the control, CRC, CRC + Fn and CRC + Fn + Cys groups; the same was true for fungi (Fig. 6a, right).