Hi, I chose the target as "selected residues", then selected the residue I want to put certain color on, but only a bond color was changed when I did that.  However, if I did not select a residue, then the color option will change the color for the whole helix selected.
 
thank
Xuehong
 
Xuehong Liu, Ph.D
Research Assistant Professor
Department of Physiology/Pharmacology
Oregon Health & Science University
3181 SW Sam Jackson Park Rd. L334
Portland, OR 97239
phone: (503) 494-3230
fax:       (503) 494-4352