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Effect of age of the pups on place preference in early and late postpartum dams: (A) Percentage of early and late postpartum dams in each preference category after conditioning with 4-7 day-old and 12-15 day-old pups. (B) Proportion of time spent by early and late postpartum dams in each cue-associated chamber after conditioning with 4-7 day-old and 12-15 day-old pups.
