huSiglec-9-CHO-K is primarily used in immunological research due to its role in modulating immune responses. It serves as a valuable tool for studying interactions between immune cells and pathogens, particularly in the context of immune evasion mechanisms. The molecule is employed in assays to investigate sialic acid-dependent binding events, which are critical in inflammation, cancer progression, and microbial infection. Its application extends to the development of targeted therapies, especially in oncology and autoimmune diseases, where modulating Siglec-mediated signaling pathways can help regulate immune cell activity. Additionally, it is utilized in the design and testing of glycan-based inhibitors and biologics aimed at disrupting pathological immune interactions.