Synonyms :  CD28 
Host :  CHO cell 
Sequence :  The extracellular domain of mouse CD28 (NP_031668.3)(Lys21-Lys149) is fused to the N-terminus of the Fc region of mouse IgG2a. 
Molecular Mass:  41 KDa(monomer) 
Purity :  >98%，by SDS-PAGE under reducing conditions.  
Endotoxin Content :  <0.06 EU/μg as determined by LAL test. 

Activity:  Measured by its ability to inhibit IL-2 secretion by stimulated Jurkat human acute T cell leukemia cells. 
Formulation :  Lyophilized from 0.2μm-filtered solution in PBS. 
Reconstitution :  Reconstitute at 100μg/ml in sterile PBS. 
Use / Stability :  
Stable for at least 1 year after receipt when stored at -20°C. Working aliquots are stable for up to 3 months when stored at -20°C. 
Avoid freeze/thaw cycles.