# X-PLOR

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This article is about the software package. For the trade association, see [Xplor International](/source/Xplor_International).

**X-PLOR** is a computer [software](/source/Software) package for computational structural biology originally developed by [Axel T. Brunger](/source/Axel_T._Brunger) at [Yale University](/source/Yale_University). It was first published in 1987 as an offshoot of [CHARMM](/source/CHARMM) - a similar program that ran on [supercomputers](/source/Supercomputer) made by [Cray](/source/Cray) Inc. It is used in the fields of [X-ray crystallography](/source/X-ray_crystallography) and [nuclear magnetic resonance spectroscopy of proteins](/source/Nuclear_magnetic_resonance_spectroscopy_of_proteins) (NMR) analysis.[1]

X-PLOR is a highly sophisticated program that provides an interface between theoretical foundations and experimental data in structural biology, with specific emphasis on X-ray crystallography and nuclear magnetic resonance spectroscopy in solution of biological macro-molecules. It is intended mainly for researchers and students in the fields of [computational chemistry](/source/Computational_chemistry), [structural biology](/source/Structural_biology), and computational molecular biology.

## See also

- [Comparison of software for molecular mechanics modeling](/source/Comparison_of_software_for_molecular_mechanics_modeling)

- [Molecular mechanics](/source/Molecular_mechanics)

## References

1. **[^](#cite_ref-1)** Güntert, Peter (2011). "Automated protein structure determination from NMR data". In Dingley, Andrew J.; Pascal, Steven M. (eds.). *Biomolecular NMR spectroscopy*. Vol. 3. Amsterdam: IOS Press. p. 341. [doi](/source/Doi_(identifier)):[10.3233/978-1-60750-695-9-338](https://doi.org/10.3233%2F978-1-60750-695-9-338). [ISBN](/source/ISBN_(identifier)) [9781607506942](https://en.wikipedia.org/wiki/Special:BookSources/9781607506942). {{[cite book](https://en.wikipedia.org/wiki/Template:Cite_book)}}: |journal= ignored ([help](https://en.wikipedia.org/wiki/Help:CS1_errors#periodical_ignored))

## External links

- [The program's reference manual hosted at Oxford University](https://web.archive.org/web/20060414175027/http://www.ocms.ox.ac.uk/mirrored/xplor/manual/htmlman/htmlman.html)

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