On 14 Jul 2010 at 17:58, Robert Hanson wrote:

> 
> I'm pretty sure you are wrong about the word "must" there. Can you find that 
> specific requirement 
> in the second of those references? 


It seems that was dropped in recent versions of the format; I have a local copy 
of 
pdbguide2.2 where for atom names they refer to Appendix 3, and there it is said
   COLUMN     VALUE                                 
   -----------------------------------------------------------------------
   13 - 14    Chemical symbol - right justified, except for hydrogen atoms

After all, that's just atom name; element symbol is now in columns 79-80, so 
not such need 
to be very consistent. However, I'm sure the amino acids use standard atom 
names, so 
maybe they just omit the detail now but they still use it.

This reminds me of the time when calcium and alpha carbons were mistaken! Due 
to this 
aligment.






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