The `calc_dihedral` function is a part of the `Bio.PDB` module in Python. It calculates the dihedral angle between four atoms in a protein structure. The dihedral angle is the angle between two planes defined by four atoms, where each plane is formed by three consecutive atoms. The function takes four `Atom` objects as input and returns the dihedral angle in radians. This function is useful in studying the conformation and flexibility of proteins, as well as in analyzing protein dynamics and protein-ligand interactions.
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