[gmx-users] do_dssp

[minnale]

Hi all, 
  I want to analyse secondary struture of my protein which have run MD for 7ns. I have checked in archives about do_dssp, found that can use only .pdb file instead of .trr and .tpr. Then if type command with -h it has it has given .xtc, .tpr,  and .ndx should use.
I am bit confusing with about do_dssp command.
Can you explain me clearly.  
Thanks in advance.
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