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FIG 5
Classification and characteristic of env genes in DrERVs. (A) Phylogenetic tree of 71 env genes and diagrams of the ISD of four env groups. (B) Annotation of DrEnv1–4 protein groups, in which the representative elements are selectively shown. The ERV-E18.4b.4-DanRer of DrEnv4 does not follow this feature. (C) Pattern diagram of the structure of a representative Env protein located in the cell membrane. (D) Schematic diagram of the transcription and splicing of the env gene of ERV-E5.1.38-DanRer.
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