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Hebb, A. (2002). Odor-Induced Variation in Anxiety-Like Behavior in Mice is Associated with Discrete and Differential Effects on Mesocorticolimbic Cholecystokinin mRNA Expression. Neuropsychopharmacology, 27(5), 744–755. doi:10.1016/s0893-133x(02)00354-8 
10.1016/s0893-133x(02)00354-8