TNF and atrial fibrillation: Chronic inflammation is a recognized risk factor for CRC.[17] ELISA results showed that the expression of pro‐inflammatory cytokine Tumor necrosis factor‐α (TNF‐α) (Figure 2K) was upregulated in FMT‐AM group, while anti‐inflammatory cytokine Interleukin‐10 (IL‐10) (Figure 2L) was upregulated in FMT‐AF group.