I ran across an ad from Serotec on an F4/80 antibody that works in mouse. It's a rat anti-mouse monoclonal that is reported to work in frozen and paraffin embedded tissues. Here's the link to their datasheet: http://www.ab-direct.com/catalog/datasheet.aspx?ProductCode=MCA497GA&SearchType=RelatedProductsFamily&SearchString=MCA497A488
Best of luck to you!
Teri Johnson, HT(ASCP)QIHC
Managing Director Histology Facility
Stowers Institute for Medical Research
1000 E. 50th St.
Kansas City, MO 64110
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