TTK and neoplasm: Figure 7C,D shows that the number of tumor nodule in the lungs of TTK-knockdown A549-beraing mice was much less than that in the lungs of control A549 mice. IHC staining reveals that the expression of TTK in the tumor sections of control A549 mice was higher the tumor sections of lungs of TTK-knockdown A549-beraing mice (Figure 7E).