i) Interstitial cells of Hydra
ii) Neoblasts of Planaria

i) Interstitial cells of Hydra:

Hydra is a freshwater cnidarian that exhibits remarkable regenerative abilities. One of the key factors responsible for this is the presence of interstitial cells, also known as stem cells or multipotent cells. These cells have the ability to differentiate into various cell types and are responsible for maintaining tissue homeostasis and regeneration in Hydra.

Interstitial cells are located in the mesoglea, which is the non-cellular layer that separates the outer ectodermal and inner endodermal layers of the Hydra. These cells are small and round in shape and can be identified by their distinctive morphology and the presence of cytoplasmic extensions. Interstitial cells are present throughout the body of the Hydra and are continuously dividing and differentiating to replace damaged or lost cells.

The interstitial cells of Hydra are responsible for the formation of all cell types in the body. They can differentiate into nerve cells, muscle cells, gland cells, and germ cells, among others. When a Hydra is injured, the interstitial cells at the site of the injury start dividing rapidly to form a mass of cells known as a blastema. This blastema differentiates into the required cell types to _____ ______ _________ __________ ___.
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