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. 2020 Apr 10;6(15):eaaz2441. doi: 10.1126/sciadv.aaz2441

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Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 1 — (A) Phylogenetic tree of the representative typical microbial rhodopsins (green), HeRs (yellow), and SzRs (pink). The SzRs originated from Asgardarchaeota and from unknown microorganism are indicated with magenta and blue circles, respectively. The molecular orientations of the typical microbial rhodopsins and HeRs are schematically shown. N, N-terminus; C, C-terminus; EC, extracellular side; CP, cytoplasmic side. (B) Multiple amino acid alignment of SzRs with typical microbial rhodopsins and HeRs for the helices C, D, F, and G. Their full sequences are shown in fig. S2.