Fig. 4.

Glut4 protein is detectable in human tracheal and bronchial epithelial cells by immunohistochemistry. Glut4 appears to be expressed by ciliated cells (black arrows) and by nonciliated cells (white arrows) in the human trachea (A) and bronchioles (C). Blood vessels (arrowheads) are located within 50–100 μm from the tracheal and bronchial epithelial cells. B, D, and F: control sections processed with nonspecific isotype control antibody. E: adipose tissue was used as a positive control tissue where Glut4 is known to be expressed.