– S100A8 and S100A9 (also known as MRP8 and MRP14, respectively) are Ca2 binding proteins belonging to the S100 family. They often exist in the form of heterodimer, while homodimer exists very little because of the stability. S100A8/A9 is constitutively expressed in neutrophils and monocytes as a Ca2 sensor, participating in cytoskeleton rearrangement and arachidonic acid metabolism. S100A9 Protein, Cynomolgus, Recombinant (His) is expressed in E. coli expression system with N-His tag. The predicted molecular weight is 14.70 kDa and the accession number is A0A2K5VRV3.