The present invention relates to a mutated gene coding for a mutant LAT protein leading to exaggerated T.sub.H2 differentiation. The invention relates to biological structures containing the mutant, particularly non-human LAT gene, mutated animals, plasmids, chromosomal DNAs, embryos comprising the mutated gene, and applications thereof. The invention further relates to screening methods for drugs useful for treatment against asthma and allergy. Otherwise, the invention relates to methods for producing IgE antibodies.

 
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