Leave blank 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 the chain of interest or the residue range, or both.
Note: This tool can handle missing residues within the selection (to manage flexible/unstructured sections).
If residue ranges are specified, they must be the same length for the two monomers (e.g., 1-300 and 301-600).
If only chains are selected, the residue numbering should be the same in both.