Rec Protein A-HRP This recombinant protein A is purified from cytosol of an E. coli strain expressing the genes coding for Staphylococcus aureus protein A. This version is conjugated with highly purified horseradish peroxidase. Label or Dye: HRP (Horseradish Peroxidase) Product Size: 3 mg Shipping Condition: Wet Ice Regulatory Statement: For Research Use Only. Not for use in diagnostic procedures. 2-8°C. Do Not Freeze.