Kathy, 
            I've used a iNOS antibody (Ab) Rabbit polyclonal (iNOS) Upstate biotechnology Cat 06-295 on mouse and Rat tissue on  formalin fixed paraffin embedded tissue (FFPE) as I remind all my PI principal investigator I will tell you that I only fix for samples for IHC for 24 hour then I process the tissue. With some Ab it doesn't matter but this one I've seen problems with longer fixed samples. With this Ab I was fortunate to have a good positive control Leishmania infected  mouse footpads very positive. So here is what I did,  sectioned at 4-5 um air dried overnight placed slides in 60 degree C oven for about 20-30 minutes Just to melt the paraffin , and make sure my slides are dry) then dewax/ dehydrate to water enzyme digested for 20 minutes at 37 w/ trypsin (Zymed labs) then do IHC.
  Primary Ab (2.5 ug/mL) 1 hour, serum block (5%  goat serum that ever secondary is made in), secondary biotinylated Vector labs (anti-Rabbit) . And I got great Macrophages infected with parasite staining. I used AEC for publication stuff  better contrast but DAB for everything else. There is this other chromogen I use NOVARED Vector Labs you can dehydrate to xylene and mount w/ permount I use that now...Hope it works for you.


 
>>> kwalters <kwalters@blue.weeg.uiowa.edu> 04/19 8:33 AM >>>
Help....I need to do an immunocytochemistry run for inducible nitric oxide 
synthase.  The paper I have uses anti-iNOS (polyclonal) from Transduction=20
laboritories.  Has anybody had experience with this antibody?  Is there a 
better one?  Does it require drastic retrieval methods?

Any help or comments are appriciated!!!!

Thanks,
Kathy

Kathy Walters                                // 
Central Microscopy Research Facility        / /
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