Evaluating Unexpectedly {Short|Brief|Quick} Non-covalent Distances in X-ray Crystal Structures of Proteins with Electronic Structure {Analysis|Evaluation}

We investigate unexpectedly {short|brief|quick} non-covalent distances ( 1,000 structures. {Although|Even though|Though|Despite the fact that|While} our non-covalent distance criterion excludes {standard|regular|normal|common|typical} hydrogen bonds {known|recognized|identified} {to be|to become} {essential|important|crucial|vital|necessary|critical} in protein stability,…