Mice, KnockoutPhenotypeBehavior, AnimalFeeding BehaviorMice, Inbred C57BLSocial BehaviorHealth BehaviorGene Knockout TechniquesBehaviorSexual BehaviorSexual Behavior, AnimalExploratory BehaviorChild BehaviorMice, Inbred StrainsAdolescent BehaviorMaternal BehaviorChild Behavior DisordersMice, Inbred BALB CSpleenBehavior TherapyStereotyped BehaviorDisease Models, AnimalMice, TransgenicMice, Mutant StrainsTime FactorsMotor ActivityAggressionAgonistic BehaviorRisk-TakingChoice BehaviorNesting BehaviorCells, CulturedBrainSelf-Injurious BehaviorMice, Inbred CBALiverAppetitive BehaviorMice, Inbred C3HRNA, MessengerSocial Behavior DisordersPredatory BehaviorModels, BiologicalBehavior, AddictiveSignal TransductionImpulsive BehaviorAnalysis of VarianceMice, Inbred DBAGene DeletionDrinking Behavior