Activin A is a protein that plays a crucial role in various biological processes, including cell growth, differentiation, and regulation of the immune system. It is part of the transforming growth factor-beta (TGF-β) superfamily and is produced by many tissues in the body. Activin A is involved in reproductive functions and has been studied for its potential roles in conditions like infertility and cancer. In addition to its role in reproduction, Activin A is important for wound healing and tissue repair. It influences the behavior of stem cells and can affect inflammation and fibrosis. Researchers are exploring its therapeutic potential in various diseases, making it a significant focus in biomedical research.