---
Reference:
 - Author: >
     Oleg V. Sobolev and Pavel V. Afonine and Nigel W. Moriarty and
     Robbie P. Joosten
   Title: >
     A Global Ramachandran Score Identifies Protein
     Structures with Unlikely Stereochemistry, Structure
   Year: 2020
   DOI: 10.1016/j.str.2020.08.005
 - Author: >
     Bart van Beusekom and Krista Joosten and Maarten L. Hekkelman and
     Robbie P. Joosten and Anastassis Perrakis
   Title: >
     Homology-based loop modeling yields more complete crystallographic
     protein structures
   Journal: IUCrJ
   Year: 2018
   DOI: 10.1107/S2052252518010552
 - Author: Rob W.W. Hooft and Chris Sander and Gerrit Vriend
   Title: >
     Objectively judging the quality of a protein structure
     from a Ramachandran plot
   Journal: CABIOS
   Year: 1993
   DOI: 10.1093/bioinformatics/13.4.425
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