Besides Genzyme, we know of two other companies with kits for Murine IL-1B: Perseptive Diagnostics 800-343-1346 and Biosource Int'l. 800-242-0607. We can't vouch for quality, though. Good Luck! Regards, Linscott's. -- Linscott's Directory of Immunological & Biological Reagents 4877 Grange Rd. Santa Rosa CA 95404 707-544-9555