Fig. 5: Comparison of neutron data quality at active site residues Tyr166 and His30 between Earth- and microgravity-grown perdeuterated MnSOD crystals.

a Neutron structure from Earth-grown wild-type Mn3+SOD crystals with light blue 2|Fo| − |Fc| neutron scattering length density displayed at 1.0σ. b Preliminary neutron structure from microgravity-grown Tyr34Phe Mn3+SOD crystals with light blue nuclear 2|Fo| − |Fc| density displayed at 1.0σ. Both data sets were collected at room temperature and density maps are calculated at 2.28 Å resolution.