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This document appears to be listing technical information about protein structures, including ligand and non-ligand bonds, hydrogen bond lengths, residues involved in hydrophobic contacts, and the corresponding atoms involved in those contacts. It lists a hydrogen bond of length 3.0 Angstroms between a histidine residue and unspecified non-ligand residues. It also lists several amino acid residues and their atoms that are involved in hydrophobic contacts with unspecified proteins or molecules.Read less