FN1 and colorectal carcinoma: Zepeda-Rivera et al. found that Fna not only comprise the majority of Fn subspecies detected within a CRC cohort but a specific clade within Fna dominates the CRC niche (Figure 2).14 Subsequent work by Qin et al. found a higher prevalence of Fna than other Fn subspecies in a CRC cohort, also noting that Fna isolates had a higher rate of genome coverage detection within the CRC samples when compared to other Fn.