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Figure 2.
FIGURE 2. Ribbon diagram of the structure of the FitAB-IR36
complex. a, the FitA and FitB proteins are colored magenta and
cyan, respectively. DNA is colored according to gray (carbon),
red (oxygen), blue (nitrogen), and yellow (phosphorus). The four
FitAB heterodimers are numbered from I to IV. b, view of a
rotated to demonstrate that the two FitA  sheets bind on the same
face of the DNA helix. c, sequence of the 36-bp IR36 site used
for crystallization. The 8-bp inverted repeat half-sites are
highlighted in yellow.
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