The SA14-2 monoclonal antibody specifically recognizes mouse CD14. CD14 is an ~55-kDa glycosyl phosphatidyl inositol (GPI)-linked cell-surface glycoprotein that is encoded by Cd14. CD14 is expressed on macrophages, granulocytes, dendritic cells, hepatocytes, and Kupffer cells. CD14 is also expressed in a soluble form (sCD14). CD14 is a leucine-rich repeat-containing pattern recognition receptor which serves as coreceptor for bacterial lipopolysaccharide (LPS) from gram-negative bacteria. CD14 forms a complex with lipopolysaccharide (LPS), an endotoxin from gram-negative bacteria, with LPS-binding protein (LBP, a plasma protein). The LPS-LPB-CD14 complex can then associate with TLR4-MD-2 which transduces intracellular signals. In this way, CD14 can play roles in innate cellular anti-bacterial immune and inflammatory responses, such as through the stimulation of cellular IL-1 and TNF production, and in extreme cases, the development of endotoxic shock.