Figure 7. Human exocrine pancreas, immunostained for CD117/c-KIT (a.), CD34 (b.), smooth muscle actin (SMA) (c.), and S-100 (d.), counterstained with Mayer’s hematoxylin. Arrows indicate the immunoreactive localization of c-KIT, CD34, SMA, and S-100 positive interstitial cells. (Original magnification, 100x). (Reproduced with permission from Popescu et al. [25].