Wen, DakoCytomation Monoclonal Mouse PCNA, Clone PC10 (M 0879) works well in mouse tissues @ 1:200 with antigen unmasking using Citrate buffer pH 6.0. Teri Johnson Managing Director Histology Facility Stowers Institute for Medical Research 1000 E. 50th St. Kansas City, Missouri 64110 tjj <@t> stowers-institute.org