Used in research and diagnostic applications to detect and quantify CEACAM1 (CD66a), a cell adhesion molecule involved in immune regulation and cancer progression. Binds specifically to CEACAM1, enabling studies on tumor biology, immune cell interactions, and inflammatory responses. Commonly applied in flow cytometry, immunohistochemistry, and Western blotting to identify CEACAM1 expression in various cell types, including T cells, neutrophils, and epithelial cells. Also utilized in functional assays to block CEACAM1-mediated signaling, helping to investigate its role in immune checkpoint pathways and potential therapeutic targeting in oncology.