Hi Ute, You can select residues (not chains) with their mmcif_chain_id property, e.g. to select all residues with label_asym_id of 'W': sel ::mmcif_chain_id=W --Eric Eric Pettersen UCSF Computer Graphics Lab

On Aug 19, 2025, at 2:48 AM, Ute Roehrig via ChimeraX-users <chimerax-users@cgl.ucsf.edu> wrote:

Hello,

Is there a way to select atoms/chains from a mmcif file by their _atom_site.label_asym_id value instead of the _atom_site.auth_asym_id value?

Thank you for your help, Ute

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