the element has a number of properties that are typical of many transposable elements : ( i ) there is a perfect eight-base-pair inverted repeat at its ends , ( ii ) these ends are flanked by a five-base-pair direct repeat of a sequence that occurs only once in the target dna , ( iii ) there are approximately 20 copies of the element in the yeast genome , and ( iv ) there is considerable strain-to-strain variation in the sizes of the restriction fragments on which these copies lie .
C0012868
transposable elements
C0012854
dna