CD8A and cardioembolic stroke: As shown in the heatmap and violin plot, compared with the control sample, T cells memory activated (p < 0.001), NK cells resting (p = 0.003), macrophages M0 (p = 0.005), macrophages M2 (p = 0.003), and neutrophils (p = 0.001) infiltrated more in the cardioembolic stroke group, while B cells naïve (p < 0.001), T cells CD8 (p = 0.005), and T cells CD memory resting (p = 0.009) showed the opposite results (Figures 4(c) and 4(d)).