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However, there are limitations associated with first-generation mutant mice, which include, for example, the lack of temporal control over the mutation. Recent technical developments have started to address some of these shortcomings. Here, the authors review a newly developed inducible approach that takes advantage of synergistic interactions between subthreshold genetic and pharmacological manipulations. This approach is easily set up and can be used to study the functional interactions between molecules in signaling pathways. 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