Miguel and Tim,
Thanks for your advice. Apparently some old pdb files I had been using with Chime are incompatible with Jmol. The 1A3N.pdb hemoglobin structure from the data base works fine in both environments. In response to Miguel's question, I am using the latest version of Jmol for all my displays.
Bill

Miguel wrote:
Miguel,
I was hasty in posting my question, because within the hour I
rediscovered how I had done this in Chime, and it works fine in Jmol.
My script syntax is:  select protein;  select *A; color atoms blue;
select *B; color atoms red; (or whatever colors you wish).
However, I now have a different problem. I wanted to use this technique
in showing the different segments of hemoglobin, but the pdb file for
this compound appears to be too large for Jmol to handle.
    

uhhh ... which version of Jmol are you using?

  
It loads in
Chime, but does not display in Jmol. Is there a size limit on the
structures Jmol will handle?
    

There are no limits on model size. Size is limited by available memory.

Jmol v10 easily handles hemoglobin (1A00.pdb?) with >5K atoms.


  
I had noted earlier that the very large protein ricin failed to load as
well.
    

I have successfully loaded a full rhinovirus with 348K atoms. Somewhat
slow, but it works.


Miguel



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