[gmx-users] Why does protein carry charges?

Chih-Ying Lin chihying2008 at gmail.com
Sat May 23 06:08:17 CEST 2009

I got the protein crystal structures from the PDB file.
There are only residues and water in the PDB files.

Why does the protein carry charges?
Why aren't they electrically neutral?

What are their intrinsic counter ions ?

Thank you

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