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The figures/data were obtained from VIPERdb ( and cite the following reference

VIPERdb2: an enhanced and web API enabled relational database for structural virology.
Mauricio Carrillo-Tripp, Craig M. Shepherd, Ian A. Borelli, Sangita Venkataraman, Gabriel Lander, Padmaja Natarajan, John E. Johnson, Charles L. Brooks, III and Vijay S. Reddy

Nucleic Acid Research 37, D436-D442 (2009); doi: 10.1093/nar/gkn840

[PubMed Abstract]

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