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Structure of sm-Tmα81. A, superimposition of the two dimers in the asymmetric unit of the structure of sm-Tmα81 (r.m.s.d. of 1.6 Å for 149 superimposable Cα positions within a distance cutoff of 2.0 Å). B, superimposition of the structure of sm-Tmα81 (chains A and B) with that of sk-Tmα81 (chains A and B). The two structures superimpose with r.m.s.d. of 1.0 Å for 143 Cα positions.
