Description Proteinase K Antigen Retrieval kit is designed to break the protein cross-links, therefore unmask the antigens and epitopes in formalin-fixed and paraffin embedded tissue sections, thus enhancing staining intensity of antibodies. This package is good enough for 200 IHC/IF tests. Contents Proteinase K Stock Solution (20×)———-1ml Proteinase K Dilution Buffer—————-20ml Application Unmask the antigens and epitopes for IHC/IF or in situ TUNEL assay Storage Proteinase K Stock Solution (20×) should be stored at –20 ºC. Proteinase K Stock Solution (20×) can be aliquoted and stored at –20 ºC for 2-3 years.