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Regeneration is a biological process by which organisms repair or replace damaged or missing tissues. This process involves the growth of new cells, tissues, and organs to restore the original structure and function of the affected area.

In animals, regeneration is often seen in the healing of wounds, where damaged tissues are replaced by new tissue growth. For example, salamanders can regrow lost limbs, while humans can regenerate skin and intestinal tissue. In some organisms, regeneration is a highly complex and sophisticated process, allowing for the restoration of entire organs, such as the heart in some species of flatworms.

Regeneration is made possible by the presence of stem cells, which are undifferentiated cells that have the ability to differentiate into various cell types. These stem cells are found in damaged tissues and are activated to proliferate and differentiate into the specific cell types needed to repair the damaged area. The process of regeneration is thought to involve a series of complex signaling pathways that coordinate the activity of stem cells, growth factors, and other cellular components.

Regeneration is an important area of study in the fields of biology, medicine, and biotechnology, as it has the potential to improve treatments for injuries, diseases, and aging-related disorders. Researchers are working to understand the mechanisms of regeneration and to develop new therapies that can promote tissue repair and regeneration in humans.

Regeneration can be divided into different types, including epimorphic regeneration, where a complete copy of the original part is regenerated, and morphallactic regeneration, where the damaged part is replaced by a new structure that is different from the original.