The SP-D protein plays a critical role in the lungs defense mechanisms against inhaled microorganisms, organic antigens, and toxins. This multifunctional protein interacts with a variety of compounds, including bacterial lipopolysaccharides, oligosaccharides, and fatty acids, to modulate leukocyte activity in immune responses. SP-D Protein, Rhesus Macaque (HEK293, His) is the recombinant Rhesus Macaque-derived SP-D protein, expressed by HEK293 , with C-His labeled tag.