Demo: SHH concentration and eye position
A reduction in the level of sonic hedgehog (SHH) gene expression can lead to cyclopia.
1 minute 22 seconds
Play Large: MOV / WMV (11 MB)
Play Small: MOV / WMV (4 MB)
To download the videos, in Internet Explorer right-click the link and select "Save Target As..." In Firefox right-click and select "Save Link As..." In Safari right-click and select "Download Linked File As..."