In the following, screenshots for each step appear when hovering the mouse over (image). If you cannot see the whole image, you can use the keyboard arrows to move to the right or to the bottom while holding the mouse over the image.
In this tutorial, it is assumed that you have followed the steps described in Tutorial 1, i.e. the Cytoscape session pdb1hiv_h.cys is opened and the corresponding 3D structure is loaded in Chimera.