SMc01113 protein homologs were aligned using T-Coffee (30). The red bar underlines the conserved motif used to classify this protein family. The corresponding gene names are as follows: Agrobacterium tumefaciens, Atu0358; S. meliloti, SMc01113; Brucella abortus, BruAb1_2129; Rhizobium etli, RHE_CH00374; Rhizobium leguminosarum, RL0393; Bradyrhizobium japonicum, b110793; Mesorhizobium loti, mlr5536; and “Aquifex aeolicus,” Aq1354.