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The Endocrine Disruption Exchange
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Critical Windows of Development Timeline

Medical DictionaryMedical DictionaryLEARNING MODULEStep 1: Normal Human prenatal development 

Click on a circled number to see a list of events in each week of prenatal human development. Learning module Answers

step 2: low-dose effects in lab animals

Choose one or more chemicals (right), then click on a circled number in the colored bars that appear. You will see research findings on the effects in lab animals from low-dose chemical exposure during the selected period of development. Note that the length of the colored bar reflects the overall duration of exposure in animals, and the numbers indicate how many research findings will be shown.

Normal Human Prenatal Development

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Low-Dose Chemical Research

Bisphenol A
Dioxin
Phthalates
Chlorpyrifos
PFCs
All Chemicals
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Central Nervous System
Normal Human Development
Bisphenol A
Dioxin
Phthalates
Chlorpyrifos
PFAS
Female Reproductive System
Normal Human Development
Bisphenol A
Dioxin
Phthalates
Chlorpyrifos
PFAS
Male Reproductive System
Normal Human Development
Bisphenol A
Dioxin
Phthalates
PFAS
Endocrine System
Normal Human Development
Bisphenol A
Dioxin
Phthalates
Chlorpyrifos
PFAS
Immune System
Normal Human Development
Bisphenol A
Dioxin
Phthalates
Chlorpyrifos
PFAS
Other Systems
Normal Human Development
Bisphenol A
Dioxin
Phthalates
Chlorpyrifos
PFAS