The blue bars turned red to show where and when exposure to low doses of the selected chemical(s) affect lab animals.
- Look at how many different systems, glands and organs are affected.
- See how early in prenatal development the chemicals have effects.
- All of these studies were done using very low doses of a single chemical.
Step 1. Click the black triangles to read about normal human prenatal development.Step 2. Choose a chemical to see where and when exposure to low doses affects lab animals.
Then click the colored triangles for study details.
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KEY - WHAT THE BARS AND TRIANGLES MEAN
Black triangles (below the lines) show the timing of events in the development of a human embryo or fetus. Click on a black triangle for a description of the event.
Blue bars begin with the first black triangle representing the first known event in normal human development for that row. All blue bars extend to the end of human gestation (38 weeks).
appear when a chemical is chosen. Red bars indicate the systems (rows) where research has shown that exposure to low doses of a chemical has effects in lab animals.
The indicates the duration (start and end points) when the animals in the study were exposed to the chemical. For chemicals that accumulate in the body, exposure is indicated to the end of the timeline even when dosed only once. Multiple studies in one row will have overlapping red bars.
When a colored triangle is clicked, the yellow, showing the start and end points of chemical exposure for that individual study.
Colored triangles (above the lines) represent studies in which chemical affects have been shown in lab animals. Click on a colored triangle to see the study details.
The 
and 
cluster icons represent study 'clusters' - multiple studies with overlapping start points. Click the cluster icon to reveal the triangles, then click triangles as usual to interact.
Note that if chemical exposure occurred earlier than the first known developmental event, the colored triangle may be isolated to the left of the blue or red bar.
