Description: Learn how to create systems.
Keywords: pdb, systems, build, force-field, hydrogens

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# Creating a System

Systems are one of the required inputs to any simulation based calculation so here's how to make (or build) one.

To build a system:

1. In the main menu go to Object->New->System. This opens the system builder.
2. Click 'Load' and choose a PDB file.

- If you have an internet connection you can type the four letter pdb code of a protein and click 'Load' - Adun will fetch it for you.

3. Choose the parts of the pdb you want to be in your system from the selection menu.
4. Choose a force-field.
5. Click Create.

## See also

Systems
Adding Hydrogens
System Topics