Cover illustration. Mammary gland whole-mount comparison following exposure to TCDD on gestation day (GD) 15 and 20 or postnatal day (PND) 1. Visible stunting of development was obvious following exposure on GD 15 only, defining this as a "critical" period of mammary bud outgrowth. See the article by Fenton et al. on pp. 63-74.
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