According to online wikipedia, stem cells are one of the smallest functional units found in all multi-cellular organisms. Similar to other cells, they retain the ability to renew themselves through cell division. The distinction, however, is that stem cell can differentiate into a diverse range of specialized cell types that perform a specific task. There are two types of stem cell based on the source: first are the embryonic stem cells which are found in embryos and second are the adult stem cells which are found in adult tissues. Stem cells are expected to be a future medication due to their ability to mend various body systems. For example, when someone suffers an irreparable damage in his/her eyes tissues, the stem cell therapy can be used to restore it. As the stem cells are put into the damaged eye tissues, the stem cell will then differentiate and thus become another eyes’ cells that perform the same task as other eyes’ cells do.
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