Answer;
-Stem cells
Step-by-step explanation;
-Stem cells special cells found in all tissues of the body that may offer promise for addressing diseases like Parkinson's and Alzheimer's.
Stem cells are a class of undifferentiated cells that are able to differentiate into specialized cell types. Commonly, stem cells come from two main sources: Embryos formed during the blastocyst phase of embryological development (embryonic stem cells) and Adult tissue (adult stem cells).
Both types are generally characterized by their potency, or potential to differentiate into different cell types (such as skin, muscle, bone, etc.).