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Heme cofactor and disordered N-terminus of the I5F Tt H-NOX structure. Composite omit map at 1.0 σ indicating two conformations (A & B) of the first 6 N-terminal residues. Residues 1 − 6 are shown in sticks with yellow carbon, red oxygen, and blue nitrogen atoms. The heme cofactor, coordinating water molecule, and coordinating histidine 102 are also shown in stick and with corresponding composite omit density for comparison.
