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Table 1 Amino acids (and water) with their modeled degrees of freedom.

From: Fast automated placement of polar hydrogen atoms in protein-ligand complexes

Amino Acid Degrees of Freedom #Modes
Asparagine Flip state 2
Aspartic Acid Protonation 3
Cysteine Protonation, dihedral angle 13
Glutamine Flip state 2
Glutamic Acid Protonation 3
Histidine Flip state, protonation 6
Lysine Protonation, dihedral angle 18
Serine Dihedral angle 12
Threonine Dihedral angle 12
Tyrosine Dihedral angle 12
Water Both hydrogen atoms 60