Active site Amino Acid Motifs Amino Acid Sequence Circular Dichroism Computer Simulation Crystallography, X-Ray Detoxification Dioxygenase Dynamics Escherichia coli Free Radical Scavengers Hemoglobin In-vivo Ligands M. tuberculosis Models, Molecular Molecular Sequence Data Molecular dynamics Molecular dynamics simulations Mutant Proteins Mycobacterium smegmatis Mycobacterium tuberculosis Nitric Oxide Nitric oxide Nitrosative stress Oxidation-Reduction Pliability Porphyrins Pre A motif Protein Structure, Secondary