Dear GROMACS users,
Is there a convention about the chirality of the HA1 and HA2 hydrogen atoms in Glycine (relative to the C-alpha)? Glycine is non-chiral, but if one tries to mutate it to another L amino acid, one of these hydrogens should be picked as the analog of a sidechain. Which one is it? As most PDB files do not contain hydrogens, this question seems to be about the behavior of pdb2gmx when creating a .gro file with an all-atom force field (such as opls-aa). Thanks, Ehud Schreiber.
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