I was learning how to apply non-crystallographic symmetries and build a full tetramer from a pdb file containing only a monomer of a protein
But I was unable to select all residues in all layer
Tutorial says ...
select all residues in all layers (hold down the shift key while invoking the Select All item of the Select menu).
But it doesnot happen. Can somebody do this for me...
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You can go to this site

PQS Protein Quaternary Structure Form at the EBI

Enter the PDB of your monomer and it will generate the tetramer for you.