I've seen protocols which use DMSO as a solvent for x-gal, and others which use dimethylformamide as the solvent. Is there any appreciable difference in using one vs. the other? Thanks! Teri Johnson Managing Director Histology Facility Stowers Institute for Medical Research 1000 E. 50th St. Kansas City, Missouri 64110 tjj <@t> stowers-institute.org