RNA backbone diagram: dihedral angles, atom colors (O red, N blue, P yellow), 5' to 3' direction of chain, and two different divisions into the phosphate-to-phosphate nucleotide (residue) vs the sugar-to-sugar "suite".
<a href="//commons.wikimedia.org/wiki/User:Dcrjsr" title="User:Dcrjsr">Dcrjsr</a>
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<span class="int-own-work" lang="en">Own work</span>