Phylogenetic trees of putative circadian clock genes in N. attenuata . Phylogenetic relationships among predicted orthologs of (A) LHY and CCA1, (B) TOC1 and PRRs, (C) ZTL and FKF1/ADO3 in Arabidopsis thaliana (At) and N. attenuata (Na). Full-length amino acid sequences were aligned and phylogenetic trees were reconstructed by the UPGMA method. The numbers given for each branch represent the numbers of amino acid substitutions per site. LHY, late elongated hypocotyl; CCA1, circadian clock-associated 1; TOC1, timing of cab expression 1; PRR, pseudo-response regulator; ZTL, zeitlupe; FKF1, flavin-binding kelch repeat F-box 1; ADO, adagio.