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. 2012 Dec 28;7(12):e53401. doi: 10.1371/journal.pone.0053401

Figure 1. General structure of PbTRIM elements.

Figure 1

(A) Schematic diagram of the general structure of PbTRIM elements. (B) Multiple alignment of selected PbTRIM elements from P. barbatus genome shows the typical structure of LTR retrotransposons. The 5′ and 3′ LTR are indicated by the leftwards dashed arrows underneath the sequence alignment. Structural features are marked on the top of the aligned sequences. Green thick arrows indicate the PCR primer biding sites. LTR: long terminal repeat; PBS: primer binding site; PPT: polypurine tract; TSD: target site duplicate; U3: unique 3′ RNA region; R: repeated RNA region; U5: unique 5′ RNA region.