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If you select User-specified from the first drop down - the Specific residue name will be use
If you select any other option from the left hand drop-down - then the Specific residue will be ignored
Any polymer means the residue may be in a polymer chain OR a ligand
For a User-specified rsidue then residue-1 name must be supplied, everything else is optional
Residue names include NAG, ASN
Atom names can be N, N* and a blank value means any atom