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Types of retro elements: pseudogene, retrogen, retropozon, retrotranspozon, retrovirus. The meaning of symbols is as follows.: LTR-long terminal repeats, P-promoter, AAAA-adenine polynucleotide chain, ORF1-Open Reading Frame, PBS-tRNA primer binding region (primer binding site), gag-the gene encoding the structural proteins, pol-gene encoding reverse transcriptase, env-the gene encoding the envelope proteins.
