The above is a backbone model of lyzozyme with the backbone CA atoms displayed as a tube. Grasp will also display the backbone as a ribbon.

This display was made by the following steps.

Obtain a protein PDB file using getentry or other source.

Change the filename extension to ".pdb"

Type:

setup grasp

and

grasp

or: source /sgi/local/bin/grasp.set and grasp

Click Right mouse button to get the main menu and then in the following sequence : READ | PDB File | Show List

Select your PDB file.

Click Right mouse button to get the main menu and then in the following sequence : Build | Backbone Worm | Carbon Alpha Worm

Click Right mouse button to get the main menu and then in the following sequence: Diplay | Alter |Bonds | Saved Set | Rods

Type: wc=2 (Worm color equals red)

Type: Control H, Click: Shininess, Type: 50

Type: Control H, Click: Specularity, Type: 1,1,1

Click Right mouse button to get the main menu and then in the following sequence: Set Parameters | Depth Cueing | Enter New Value | Worm, Type: 1.0

Click Right mouse button to get the main menu and then in the following sequence: Set Parameters | Depth Cueing | Enter New Value | Bonds, Type: 1.2