IL2 and atrial fibrillation: Results of co-immunofluorescence of miR-190a-5p and IL-2 revealed that miR-190a-5p (green) was downregulated, while IL-2 (red) was upregulated in the AF group compared to that in the non-AF group (Figure 3), suggesting the negative regulatory relationship between miR-190a-5p and IL-2.