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. Author manuscript; available in PMC: 2007 Sep 5.
Published in final edited form as: Nature. 1984 Oct 25;311(5988):721–726. doi: 10.1038/311721a0

Fig. 1.

Fig. 1

Formation of Holliday structures (χ-forms) during λ site-specific recombination. The attP top ( Inline graphic) and bottom ( Inline graphic) strands and the attB top ( Inline graphic) and bottom ( Inline graphic) strands have their 5′ termini indicated by a knob. The cutting and exchange of two bottom strands (left) results in form ExI, whereas the cutting and exchange of two top strands (right) results in form ExII. In the case where attL and attR are the parental DNAs (not shown here), the cutting and exchange of the two top strands would result in form ExI and the cutting and exchange of the two bottom strands would result in form ExII.