Clone NX2.1/690 is a mouse monoclonal antibody specific to the human gene, NKX2-1, or NK2 homeobox 1. Another name for the gene is TTF-1. Suppliers have reported additional species reactivites for the target of this clone, including mouse and rat. Indicated applications for antibody clone NX2.1/690 include immunohistochemistry, flow cytometry, and immunofluorescence.