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LOL the secondary structure is actually a 3D representation of a protein but the tertiary structure is a much more perfect representation.

No, it is not a 2D representation of protein. I personally feel the primary structure would pass for that but I haven’t seen that anywhere so I can’t particularly verify that :)

Okii got it :)

Primary structure is 1D (if you mean sequence info). And if you just consider a poly-peptide, its again 3D

That’s true. Makes a lot of sense that way.