Figure 1.

Diagrams of TART elements in different Drosophila species drawn approximately to scale. 5′, 5′ UTR; 3′, 3′ UTR; Gag, ORF1; Pol, ORF2; AAA, the 3′oligo(A) that characterizes non-LTR retrotransposons. The TART^mel element shows an average of the sizes of the 5′ and 3′ UTRs of the three subfamilies, TART^melA, TART^melB, and TART^melC. The TART^ame is the only fragment cloned. Dotted lines represent putative flanking regions. Solid bars above and below elements correspond to probes (see Materials and Methods).