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+{{tag>other}}
+====== Ramachandran Plot =======
+This is a diagram of the sterically allowed regions for a dipeptide unit in phi,psi
+space. The conformation of the dipepetide is defined by 2 dihedral angles:
+phi (the angle of rotation around the N-C-alpha bond in a peptide unit),
+and psi (the angle of rotation around the
+C-alpha-C' bond in a peptide unit). The plot indicates whether a given phi,psi
+conformation is sterically allowed. A conformation is not allowed if atoms
+approach closer than the sum of their van der Waals radii. The diagram is named
+after G.N Ramachandran, who was the first to make calculations of the allowed regions
+in protein structures.
+===== References =====
+{{pubmed>long:13990617}}