Fixing and permeabilizing cells generally locks them in place and makes it possible for larger molecules such as antibodies to access the interior of the cell for better targeting of the protein or condition you're interested in.
Thermo Scientific Pierce Protein Biology Team, The Thermo Scientific Pierce Protein A/G Magnetic Beads enable efficient immunoprecipitation (IP), co-immunoprecipitation (co-IP) and antibody purification with high purity and low background.
There was no expiration date on the Certificate of Analysis (COA) for Normal Mouse Serum (Cat. No. 10410). How long is it stable when stored at -20 degrees C?