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Perinatal fentanyl exposure influences weight across development. A, Exposed male mice weigh less than controls at weaning (postnatal day [PD] 21). B, By adolescence (PD 35), both male and female mice that were exposed to fentanyl weigh more than controls. C, This weight difference is no longer present once these mice reach early adulthood (PD 55). Data depict medians and 95% confidence intervals
