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(A) Crystal structure of deoxy hemoglobin at a resolution of 1.74 Å. (B) Schematic representation of acellular type and cellular type of hemoglobin-based oxygen carriers. Hemoglobin consists of four subunits, two alpha subunits (blue) and two beta subunits (red). The crystal structure was prepared using the CueMol software and the structural coordinates of PDB 2HHB.
