Dear ChimeraX team,

When depositing models in the PDB, it is often  necessary to change the nucleotide or amino acid type to “Unknown” when the resolution is not good enough to identify the register (https://www.wwpdb.org/documentation/procedure). Would it be possible to extend the functionality of the swapna and swapaa commands to support changing residues into UNK for proteins and N/DN for nucleic acids?

Many thanks in advance,

Matthias