behavior/neurological
• mutant mice had enhanced social interest even in a familiar mice in a social novelty test
• mutant mice had significantly prolonged total interaction in a resident-intruder test
• olfactory acuity, exploratory activity level, locomotor activity and anxiety level of the mutant mice were normal
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nervous system
• decreased spine density on apical dendrites, but not on basal dendrites, of the hippocampal CA1 region
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• hippocampal neurons did not complete activity-dependent phosphorylation of CREB in some hippocampal-dependent behaviors
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