I agree that immunoassays- more specifically RIAs and/or ELISAs are
the way to go. You mentioned some of the companies that offer
products. Let us not forget Endogen!
We're the leader in murine ELISA assay kits. Our product line has
just expanded with the acquisition of Cytokine Sciences, Inc. whose
specialty was Rat and Rabbit immunoassays in the form of RIAs. In
addition, Endogen offers a complete line of ELISAs to measure Human
Cytokines as well. These kits stand toe to toe with Genzyme and R&D
if not better!
Scott Orencole
Orencole at Endogen.com