On 30 May 1966, siow at unixg.ubc.ca wrote: A colleague of mine is looking very hard for antibodies (polyclonal or monoclonal) against rat TGF-beta1 (snip) In the March/April Serotec Product Update, a monoclonal antibody (clone TB21) against TGF beta1 is listed as a new product. The catalog number is MCA797. I have not tried it. Good luck, Jorge