A middle repetitive sequence NPR18 was isolated from Nicotiana plumbag
inifolia nuclear genome [8]. Sequences homologous to the repeat are di
spersed through genomes of several Nicotiana species. Computer-assiste
d data analysis of NPR18 primary sequence reveals several features att
ributed to mobile genetic elements: an AT content higher than average
for nuclear DNA of genus Nicotiana plants; a number of direct and inve
rted repeats. Some of the repeats displayed homology to the terminal a
nd subterminal repeats of Ac/Ds-like plant elements.