Neoblasts

Neoblasts are found throughout the body but are excluded from the pharynx. The image distinguishes between neoblasts that are in the process of dividing to form new cells (green dots) and those that are not dividing (red dots) in a freshwater planarian called Schmidtea mediterranea. If the pharynx is removed, the actively dividing neoblasts and their progeny will migrate to the damaged area and begin organ regeneration.

Original source:

http://lens.elifesciences.org/02517/index.html#figures