IL1B and atrial fibrillation: Western blot analysis evidenced that protein levels of TLR4, MyD88, NLRP3, Cleavage‐caspase‐1, and Cleavage‐IL‐1β were markedly increased in atrial tissues from the SHR‐AF group rats compared to that in those from the SHR group, whereas these protein levels were notably decreased in atrial tissues from the SHR‐AF(+sh‐FMOD) group compared to that in those from the SHR‐AF(+sh‐NC) group (Figure 6B).