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| Modern Genetic Analysis Chapter 12. Genomics Structural Genomics Figure 12-12. The general structure of some retroelements found in eukaryotic genomes. Gag, pol, and env are retroviral genes. ORF = open reading frame. AAA is a poly(A) tail. Unshaded triangles represent direct terminal repeats. Arrows show direction of transcription. (a) A retrovirus, Moloney murine leukemia virus of mice. (b) Copia (Drosophila retrotransposon). (c) Ty1 (yeast retrotransposon). (d) L1, a human LINE. (Modified from J. R. S. Fincham, Genetic Analysis: Principles, Scope and Objectives. Blackwell, London, 1994.)

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