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. Author manuscript; available in PMC: 2012 Dec 1.
Published in final edited form as: Neuroscientist. 2012 Feb 24;18(5):439–451. doi: 10.1177/1073858411431646

Figure 2.

Figure 2

The “bottom-up” approach to behavioral genetics begins in biologically less complex, genetically uniform systems, minimizing variability and providing external validation to gene association studies in the human population.