The 3D image to the left is a surface rendering of the embryo model currently in the viewer.
The position of the green disc represents the section through the embryo model that is displayed in the main window.
Any arbitrary section may be selected using the rotation and distance controls.
The 3D scene can be manipulated using mouse and keyboard keys.

3D (x3dom) Controls

The only useful navigation mode for this application is the (default) Examine mode.
Using the <r> key to reset the viewpoint does NOT reset the centre of rotation if this has been changed.
If all else fails, re-load the page!