#protein complex
- Activin — A cellular protein complex and peptide hormone belonging to the transforming growth factor-beta (TGF-beta) superfamily, playing a structural role in regulating the menstrual cycle, cell proliferation, apoptosis, tissue differentiation, and the secretion of follicle-stimulating hormone (FSH) by the pituitary gland. This biochemical agent coordinates complex intercellular signaling networks in mammalian organisms.