Thanks Elaine! It works!

Best, Jiaxuan

From: Elaine Meng meng@cgl.ucsf.edu Date: Sunday, May 14, 2023 at 12:24 PM To: Cheng, Jiaxuan (NIH/VRC) [F] jiaxuan.cheng@nih.gov Cc: chimerax-users@cgl.ucsf.edu chimerax-users@cgl.ucsf.edu Subject: [EXTERNAL] Re: [chimerax-users] Measuring distance between two atoms in a single protein Hi Jiaxuan, I don't know where you are looking that suggests you can use "at" -- instead to indicate atom name it is the @ symbol.

The command would instead be something like

distance #1.16/B:94@CA #1.35/B:94@CA

How to write atom-specs in the command line is described in this page: <https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Frbvi.ucsf....https://rbvi.ucsf.edu/chimerax/docs/user/commands/atomspec.html>

I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco

On May 12, 2023, at 9:19 PM, Cheng, Jiaxuan (NIH/VRC) [F] via ChimeraX-users chimerax-users@cgl.ucsf.edu wrote:

Hi Elaine,

I met a problem when measuring the distance between two atoms. I entered “distance #1.16/B:94 at CA #1.35/B:94 at CA” , but the ChimeraX reports “expected a keyword”. Could you let me know how to solve it?

Thanks! Jiaxuan

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