Hi,

I was comparing two very similar structures and I got the following results:

align pdb1, pdb2, cycles=0

0.38

align pdb1, pdb2 and name ca, cycles=0
0.05

align pdb1, pdb2 and name ca+cb+c+n, cycles=0
0.07


align pdb1, pdb2 and name ca+cb+c+n+o, cycles=0
9.8

I wonder why the addition of the O atom increases the RMSD so much esp when all 
atom RMSD is only 0.38A.

Thank you

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