RT-PCR analysis of expressional patterns of 4 retroposons (At5g63070, At5g66830, At2g03410, and At1g53345) in different Arabidopsis tissues. Total RNA samples were prepared from roots (lanes marked with 1), shoots (2), leaves (3), and flowers (4). M, DL2000 molecular marker. The RT-PCR products corresponding to Actin transcripts were indicated.