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How does one interpret/read the following graph (found here) as well as on wikipedia or

PDB graph

What are these called?

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    $\begingroup$ According to your first link, this is from an x-ray diffraction image of human obesity protein, or leptin. It's called a ribbon diagram (and maybe other things, not my area of expertise). $\endgroup$ – airhuff Oct 10 '17 at 16:38
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    $\begingroup$ Well, I'd call them coordinate/arbitrary axes...if you're talking about the arrows at the bottom left ;) $\endgroup$ – paracetamol Oct 10 '17 at 16:39
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    $\begingroup$ en.wikipedia.org/wiki/Ribbon_diagram $\endgroup$ – Mithoron Oct 10 '17 at 17:16
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This depiction is a ribbon diagram of a protein structure. It shows the protein backbone (alpha carbons and the peptide bonds) smoothed out to a continuous line. In certain areas where the protein adopts alpha-helices or beta-sheets, these are indicated by the elaborate spiral in your picture (alpha-helix) or a wide, flat arrow (beta-sheet; not present in your structure). These depictions are supposed to give you an idea of what the protein looks like.

I would assume the two arrows in the bottom to be two of the coordinate axes of the crystal since ribbon diagrams are typically obtained from crystal structures. However, I cannot know without additional information (e.g. in a footnote of a picture).

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