Complex sentence: The primary structure of calprotectin can vary between species; for instance the mouse homologue of S100A8 is 10,295 Da, while the S100A9 homologue is 13,049 Da.
Split into simpler sentences: The primary structure of calprotectin can vary between species. For instance, the mouse homologue of S100A8 is 10,295 Da, while the S100A9 homologue is 13,049 Da.