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Mean startle response magnitudes (percentage scores) in relation to the second startle trial for dopamine D1, D2, and D3 receptor mutant mice. (A) D1 KO mice display exaggerated sensitization and deficient habituation compared with D1 WT mice. (B) D2 KO mice show attenuated sensitization and increased habituation compared with D2 WT mice. (C) D3 KO mice also display attenuated sensitization and increased habituation compared with D3 WT mice.
