[Chimera-users] how to calculate the core diameter of a trimer (the individual subunits of this trimer is a helix)

[ashok rout]

Hi,
 I have a transmembrane domain of a protein (20 amino acid long, single
helix). The NMR derived structure comes out as a coiled-coil trimer. So can
you please assists me how to calculate the core diameter of this trimer.
Regards,
Ashok

-- 
thanks & regards,
Ashok
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