Figure 2.

Comparative structures between defective retroposons and their respective parental genes. A, A 5′ truncation. One and one-half exons in the 5′ coding region of At2g45330 were missed in its retroposed copy. B, A 3′ truncation. Three and one-half exons (516 bp in length) in the 3′ coding region of At4g37120 were absent in its retroposon, At3g45950. C, Internal deletion. The exons of At4g38030 from the fourth to 10th (in part) were completely deleted in At1g65210. D, Extra sequence addition. A 63-bp fragment from mitochondrial ORF159 (AtMg01050) has been incorporated between CDS position 160 and 161 of At3g58390. Black boxes with grids represent exons that were not presented in the retroposed copies, while magenta box indicates extra sequence added. Not to scale.