Leave it blanck to use the structure defined in the first oligomeric form.
Upload a PDB file containing the two monomers or enter a PDB accession number.
For each monomer, you can specify either the chain of interest or/and the residue range which define the monomers or both.
Note: The tool can handle missing residues within the selection (to manage flexible/unstructured sections).
In this case, The 2 monomers must have a residue range filled with the same gap (i.e 1-300 and 301-600).
Please make sure that both monomers selected (with or without core regions) have the same number of Carbon-α.
