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The general structure for the residue classes is:-

(For legibility,Diagram does not include other types of residues such as nucleic acids, etc)

The structure for the amino acid residue classes is:-

The Residue Classes are made up of two main sets of Residues:

Structural Residue types which have Atoms and Bonds.
Non Structural Residue types which do not contain atoms.
All Residue types inherit from the base class Residue.