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Spontaneous Motor Activity and Within Session Habituation. (a) There was no difference between M2+/+ (n = 23) and M2−/− (n = 21) mice in spontaneous motor activity in a novel environment. The genotypes also did not differ in their habituation to the novel environment as indicated by a decrease in motor activity with time. (b) There was no difference between M2+/+ and M2−/− mice in vertical activity (rearing) in a novel environment.
