MoleculeVariant.Protein is never set upon reading a pdb, pubchem or after preprocessing using FDB

[jeleclaire]

BiochemicalAlgorithms.jl/src/core/molecule.jl

Line 276 in c7011f8

mol.variant === MoleculeVariant.Protein

When is the best way to set the MoleculeVariant to MoleculeVariant.Protein ?

When do we consider a MoleculeVariant to be a MoleculeVariant.Protein ?
Maybe the occurence of one FragmentVariant.Residue is sufficient?