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Proposed model for the 3′-end recognition of L1-clade LINEs. The ancestral L1-clade LINE in the ancestral green plant possessed a stringent, nonmammalian-type RNA recognition property. During the course of plant evolution, an L1 lineage lost the ability to recognize specifically the RNA template for reverse transcription, thereby introducing relaxed 3′-end recognition in land plants. ME1–3: plant L1 lineages; M, F: vertebrate L1 lineages.
