3qf6 is an example of a fully deuterated protein model. (There are 56 
entries in the PDB containing deuterium. You find them by Advanced 
Search, Chemical Components, Chemical Formula, and entering "D*". 
This was implemented by RCSB after I requested some way to do this. 
They point out that this method does not exclude elements without 
coordinates. Thus H* finds all entries since all contain hydrogen, 
even though many have no hydrogen atoms with coordinates.)

In 3qf6, selecting "hydrogen" selects the deuterium, while selecting 
"deuterium" selects zero atoms.

I think it may be better to have "deuterium" select the element D and 
"hydrogen" select the element H. Discussion?

On the other hand, I like that selecting "water" selects DOD or HOH.

But probably "DOD" should not select HOH (I think this is currently 
the case), and HOH should not select "DOD" (but it currently does 
select DOD in 3qf6).

-Eric


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