What is "x-plor"

X-PLOR is a software package for computational structural biology originally developed by Axel Brunger at Yale University. It was first published in 1987 as an offshoot of CHARMM - a similar program that ran on Cray supercomputers. It is used in the fields of X-ray crystallography and NMR analysis.

X-PLOR is a highly sophisticated computer 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 primarily for researchers and students in the fields of computational chemistry, structural biology, and computational molecular biology.