Hej,

I have been using Tyramide a lot for both human FFPE and frozen mouse tissues. I have had always good results with these tissues.

I am struggling to use the Tyramide systems in frozen human colorectal cancer tissue though. We freeze the tissue non-fixed and just fix the sections with 2% formaldehyde for 10 min before staining it. I am always getting a strong staining on polymorphonuclear cells because of their endogenous preoxidases. The problem is that no matter how long I block it with H2O2 or NaN3 (or combined), it never disappears and seems to be reversible. Somebody any experience with that? I want to stain MAIT cells and there are no antibodies for FFPE .... Thanks!

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