Group
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The Group command creates or updates a "group" object. The grouped objects are collected underneath a + sign in the object tree (see images).
Group is tremendously helpful with multi-state or multi-structure sessions. Wildcards work great, for example:
# put all of objState into the group "ensemble".
group ensemble, objState*
Three EF-Hand proteins loaded into PyMOL
Applied the group command to the proteins via: "group efHand, *"
The plus was clicked and expanded to show the hierarchy of objects.
Usage
group name, members, action
Example
group efHand, 1cll 1ggz 1sra
# allow addition and removal from the group
group efHand, open
# disallow addition/removal from the group
group efHand, close
Notes
Group objects can usually be used as arguments to commands. It can be processed as a group or as a selection, in which case all the atoms from all objects in the group will be used.