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Simplified phylogenetic trees of data sets SOS (a) and SOSω (b). Best ML tree (RAxML v.7.2.8, PROTCAT, LG + GAMMA) (a) based on 253 OGs, 79 of which are covered by Protura, Diplura, and Collembola (SOS) and (b) based on 174 OGs, none of which are covered by Protura, Diplura, and Collembola (SOSω). BS is derived from 1,000 bootstrap replicates. Trees were rooted with Capitella sp. For the full trees, see supplementary figure S3a and S3b, Supplementary Material online.
