**3.8 Curved DNA**

Normally, curved DNA is often seen in DNA segment containing runs of three or four bases of A in one strand and a similar run of T in the other and spaced at 10-base pair intervals. Interestingly we have recently found that trinucleotide repeats AAT can also adopt curved DNA in *E.coli*, which can be repressed by H-NS and its stimulated IS1E transposition (Pan et al., 2010)
