I got it,  Thank you, everyone.

Jason T Maynes <jmaynes@biochem.wustl.edu> wrote:
select [ligand name and/or chain] and n. [atom name]

For instance, if your ligand is chain c and you want to select the atom
named C21 in the pdb file:

select c. c & n. c21

or if your ligand has a residue name like "BME" or something similar then
you could do:

select r. bme & n. c21


"We can be sure that if a detailed understanding of the molecular basis of
chemo-therapeutic activity were to be obtained, the advance of medicine
would be greatly accelerated."

Linus Pauling, Nobel Laureate 1954

"...everything that living things do can be understood in terms of the
jigglings and wigglings of atoms."

Richard Feynman, Nobel Laureate 1965

Jason Thomas Maynes, MD/PhD
Department of Biochemistry and Molecular Biophysics
Resident in Anaesthesia and Paediatrics
Faculty of Medicine
Washington University in St. Louis

> Hi there,
> Does any one know how to select a particular atom from a ligand using
> command (I know a lot of you there know)? Could you tell me how to do
> it, I am a beginner of PyMol, I am learning and like it alot.
> Thank you.
> Feng
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