What does the prefix "Auto-" refer to in medical terminology?

In medical terminology, the prefix "Auto-" signifies the concept of self. This prefix is derived from the Greek word "autos," which means "self." It is commonly used in various medical terms to indicate that something originates from or is generated by an individual themselves. For example, "autologous" refers to cells, tissues, or organs that are derived from the same individual, highlighting the self-reliant aspect of the prefix. This understanding of "Auto-" is essential in fields such as transplantation and regenerative medicine, where self-derived materials are often preferred for their compatibility and lower risk of rejection.