The proteins of an aqueous extract of ragweed pollen (RW) were precipitated at 90% saturation with (NH4)2SO4, solubilized, and sieved through Sephadex G-15. The excluded fraction, termed the monomeric form (MRW), was cross-linked with glutaraldehyde to form polymerized ragweed (PRW). As compared with MRW, PRW is more immunogenic in rabbits in the production… (More)
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