Used to detect and quantify rat matrix metalloproteinase-9 (MMP-9) in biological samples such as serum, plasma, cell culture supernatants, and tissue lysates. It is widely applied in research settings to study inflammatory diseases, cancer progression, and tissue remodeling, where MMP-9 plays a key role. The kit enables sensitive and specific measurement of MMP-9 levels, supporting investigations in immunology, oncology, and cardiovascular research involving rat models.