I am doing a series of co-stains in paraffin sections of various mouse tissues.  

I want to keep using a panel of donkey secondary antibodies that is performing very well and yes I block in non-immune donkey serum and have tolerably low background.  We have been using a citrate boiling antigen retrieval.  

We had this all worked out but we used up the lot of poly-clonal MMR antibody that had been given us and we need new source.  

Thanks,

Neal

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