Hi Alonso.
Do you mean using DAB as a chromogen after detecting GFP with an anti -GFP 
antibody reagent?
Also, what type of tissue preparation are you using?
If you look here : http://www.immunoportal.com/index.php in the Image 
gallery, you will see some pictures  of GFP/ anti-GFP in pwax sections.
Carl 


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