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Structure of sm-Tmβ98. A, superimposition of the three dimers in the asymmetric unit of the structure of sm-Tmβ98 (r.m.s.d. between dimers range from 1.0 to 1.2 Å for 190 superimposable Cα positions within a distance cutoff of 2.0 Å). B, 2Fo − Fc electron density map contoured at 1.0σ in the region around residue Cys36. C, superimposition of the structures of sm-Tmα81 and sm-Tmβ98 (r.m.s.d. of 1.4 Å for 155 Cα atoms).
