CCN6 or MMP-9 protein expression was determined by IHC staining of tissue slides37 (link). Tissue sections were deparaffinized with xylene and rehydrated with ethanol. Endogenous peroxidase activity was blocked with 3% hydrogen peroxide. Using the antigen retrieval buffer system for IHC staining, we incubated the slides with primary antibodies against CCN6 or MMP-9. The antibody binding signal was detected by the NovoLink Polymer Detection System (Leica Microsystems, Heidelberg, Germany) and visualized using 3-3’-diaminobenzidine. The sections were counterstained with hematoxylin.
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