Serpins are a family of proteins known for their ability to inhibit proteases, which are enzymes that break down proteins. They play a crucial role in regulating various biological processes, including blood coagulation, inflammation, and immune responses. By controlling the activity of proteases, serpins help maintain balance in the body and prevent excessive tissue damage. These proteins are found in many organisms, from humans to plants and bacteria. Serpins have a characteristic structure that allows them to bind tightly to their target proteases, effectively blocking their activity. This unique mechanism makes serpins important in both health and disease, influencing conditions like thrombosis and cancer.