Imagine that you are an oxygen molecule that has just entered the blood stream of a living, breathing, creature.  Since you are the very essence of life, it is important for you to quickly fulfill your molecular duty, before our virtual creature "logs out"!  We need your help! Our creature's very life depends on YOU!!!  Find the receptor site, and then attach to the hemoglobin molecule so that you can be transported to a very needy cell... somewhere...

There are two paths to follow in our world.

1.  The first path is to simply follow a set of pre-determined viewpoints that ultimately lead to the receptor sites in the hemoglobin molecule.  Simply click on the viewpoint button on your VRML browser and go for a virtual taxi ride through the molecule.  Don't worry, the driver knows where he's going.

2.  If you are feeling particularly adventurous, take a step into the VRML world without the guided tour!  Navigate the world yourself using your VRML browser control buttons.  If you get lost, you can always hitch a ride by clicking on the view button to get you back on track.  Find your way to the receptor site and see what happens!