Dear all, I'm trying to color residues by the degree of conservation in the multiple sequence alignment of the protein. But I cannot get enough shades, only 4! I get this warning: Warning: Unable to allocate shade! Has anyone tried a similar thing, has any idea how to resolve the shade issue, or knows of another program that does this? Thanks very much! Kris My script looks like: load /home/kris/pdb1un0.ent wireframe off select *164A.ca spacefill color [54, 0, 201] select *165A.ca spacefill color [0, 118, 0] etc... for all residues and I'm using 32-bit version 22.214.171.124.1.