Hi,<br><br>I&#39;ve been unable to figure out how to colour the electrostatic surface of a protein red/white/blue. I&#39;m assuming that you have to some how assign electrostatic potential before colouring but how is this done? I&#39;m using a Mac and I&#39;ve tried to use apbs with pymol but it will not recognise my pqr file generated on the pdb2pqr server or generate it itself. 
<br><br>Thanks,<br><br>Kate<br>