Does anyone know if F4/80 can work on formalin fixed frozen mouse spleen for IHC without antigen retrieval? Also, thanks to everyone for their suggestions re. mouse B-cell markers. Thanks, Sharon -- Sharon Cooperman <scoop <@t> mail.nih.gov> NIH, NICHD, CBMB 301.435-8417 Building 18T, room 101 301.402-0078 fax Bethesda, MD 20892