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Experimental timeline of exposure to perinatal fentanyl and postnatal housing conditions. A, Timeline depicting fentanyl exposure of mouse dams throughout pregnancy until weaning of offspring on PD21. B, Offspring were weaned into standard (top cage) or enriched (bottom cage) housing conditions until behavioral (PD45/47) and electrophysiological (PD48–PD55) analyses took place. Enrichment items are numbered (1–9) and listed in Table 1.
