I work a lot with symmetrical, multi subunit structures and in order to select say residue 45 in every subunit, I must one at a time go in and in the sequence finder select the residue in each chain and then color it.  Is there a way to select all of the same number residues (say number 45, might be an alanine) in the structure displayed and color only those.  If you select alanine, it will select every single alanine in the structure.  Chimera seems to be a really powerful program, but I am pulling my hair out trying to get it to do something productive in a timely fashion.  thanks, eric.