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Examples of gene overprinting in viruses. a Outline showing different types of gene overprinting and associated nucleotide and amino acid sequences. Gene B overprints into gene A in the same direction but a different frame. Genes C and D showcase overprinting in different frames and directions. Start codons in nucleotide sequences are shown in green. b Genome of human immunodeficiency virus type I [7] with annotated genes. tat and rev splicing is indicated by a solid line
