Question: What is the expected outcome of an isosurface command for 
ligands in a model with several ligands?

I am doing this, Jmol app 14.2.3:

load =1hho;
cartoon only;
select ligand; 
spacefill 50%;  // there are 3 ligands
isosurface select(ligand) molecular; 
/*
only 2 of the 3 ligands get a surface -- why?
[HEM]143:A  no
[HEM]143:B  yes
[PO4]142:A  yes
*/

Same with other models,

load =2ejf
cartoon only;
select ligand; 
spacefill 50%;  // there are 4 ligands
isosurface select(ligand) molecular; 
/*
[BTN]1400:C  yes
[BTN]1401:A  no
[BTN]1402:B  yes
[GOL]3001:B  no
*/

Also with my preferred command variant,
isosurface select(ligand) ignore(not ligand) molecular; 
// in this case, 3 out of 4 surfaces for 2ejf

Any hints?

We were thinking today of tools for ligand highlighting and for 
rendering multiple surfaces in Proteopedia when we hit this problem.



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