When you perform intraperitoneal injection of hapten or highly homologous antigens in mouse species, most of the time your project is going to fail. Due to poor immunogenic properties and low molecular weight, your antigen is going to be eliminated in animal urine without generating any humoral immune response.

That's why we've created SynAbs in the first place, based upon an exclusive asset: the rat-LOU species and rat-LOU IR983 myeloma cell line, developed in 1983 by Hervé Bazin in Catholique University of Louvain-la-Neuve (UCL).

The custom generation of rat-LOU monoclonals is mastered by the SynAbs team since several years, as demonstrated by our 100+ references catalog and more than 1000+ fusions. The specific and proprietary rat developed and used by SynAbs, the Rat-LOU, is excellent for generating antibodies against small and poor immunogenic molecules including antibiotics, toxins, peptides, steroids, lipids, chemical entities, polysaccharides, highly conserved epitopes and transmembrane proteins.

The Rat-LOU also gives excellent results against murine antigens as surrogates and rat antibodies can be paired with existing antibodies in ELISA sandwich assays.

Last but not least, the generated antibodies are at least as stable and productive than the mouse ones, due to our proprietary rat IR983F fusion cell line, generating very stable fully rat-LOU hybridoma.

Rat-LOU species gives the access to natural immune responses to obtain higher affinity monoclonals in secondary organs like lymph nodes and bone marrow. Contrary to display technologies, in-vivo maturation leads to the optimal combination of variable and constant domains resulting in :

Rat-LOU species is a wild-type strain that exhibits a strong immune response when injected with foreign material. Its transgenic counterparts have so far shown a tendency to a low anti-serum titer. Rat-LOU generates immune responses against self-antigens, haptens, and highly homologous proteins. Consequently, SYnAbs uses it to generate monoclonals against small molecules, carbohydrates, lipids, epigenetic modifications but also complex transmembrane receptors.

The repertoire of the Rat-LOU allows the generation of unprecedented diversity of complementarity-determining regions (CDRs) on monoclonal antibodies, very different from other rodents.

Rat-LOU gives you access to Fc competent monoclonal antibodies, potentially recruiting components of the immune system for ADCC and CDC responses. Furthermore, rat Fc is very similar to Fc of human immunoglobulin.