This tiny addition is what inhibits bacterial growth, allowing you to draw from the vial multiple times for your research without fear of contamination
This functional activity is supported by a multitude of studies demonstrating that anti-inflammatory M2-like macrophages are induced in various models of pancreatic injury and inflammation and operate to promote -cell survival, proliferation, and maintenance of functional -cell mass, through the release of protective factors, such as IGF-1, epidermal growth factor (EGF), transforming growth factor (TGF), platelet-derived growth factor (PDGF), and Wnt3a (78)
Add each solvent one by one: PBS Solubility: 100 mg/mL (163.23 mM)
If it does not, the most defensible general approach is cold-chain handling: freezer storage for long-term dry powder, refrigerator storage for short-term reconstituted solution, and no casual room-temperature storage after mixing