Stem cells are the fundamental building blocks—the "master" cells—of the human body. They form the origin of all other specialized cells (such as heart muscle, brain nerves, or retinal cells).
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Exosomes are, in the simplest terms, nano-sized (one-millionth of a millimeter) "cargo packages" or "messenger vesicles" that cells use to communicate, "talk," and help one another.
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