Interference of __SP__ __NODE__ mRNA in normal epithelial cells from __SP__ tracheobronchial tissue by siRNA and interference of __SP__ __NODE__ mRNA in normal epithelial cells from __SP__ tracheobronchial tissue by siRNA and interference of __SP__ __NODE__ mRNA in normal epithelial cells from __SP__ tracheobronchial tissue by siRNA and interference of __SP__ __NODE__ mRNA in normal epithelial cells from __SP__ tracheobronchial tissue by siRNA cause little or no change in activation of __SP__ __NODE__ protein(s) in normal epithelial cells from __SP__ tracheobronchial tissue that is increased by __NODE__ in culture medium .