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Ovalbumin (OVA) exposure protocol. Adult female rats were sensitized to OVA 14 days before mating. Control rats received saline (SAL). Pregnant rats sensitized to OVA were challenged with OVA for 30 min, 4 times during the pregnancy. Control rats received SAL. Pups were collected at postnatal day 1 (PN1), 7, or 14. E1, embryonic day 1.
