Thank you, Elaine. It works! Elaine Meng <meng@cgl.ucsf.edu> 于2021年5月3日周一 下午4:04写道：

Hi Jianhao, As shown in the Usage line in the help (the link that you sent), you need the "models" keyword to limit the action to certain models, e.g. to rotate model #1 only:

turn y 180 models #1

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 3, 2021, at 3:36 PM, C.J. <biocjh@gmail.com> wrote:

Hi all,

I tried "turn y 180 #1" ( https://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/turn.html) but it doesn't work. It said "turn frame arguement must be an integer". While I tried "turn y 180 0 #1" or "turn y 180 1 #1", it said "wait_frames arguement not implemented". Even "turn y 180 0 0 #1" doesn't work. Did I miss something?

Thank you! Jianhao

-- Best regards! C.J.