+ Each of the residues in a colour scheme may be assigned any chosen colour. <br>
+ Select one or more residues, then select the desired colour.<br/>
+ Use Ctrl-click to select multiple residues, or click then Shift-click to select a block.<br/>
+ Note that the currently selected buttons are highlighted by a lighter text colour.
+ <p>
+ The 'Case Sensitive' option allows you to choose distinct colours for upper and
+ lower case residue codes.
+ <p>