Cover: Cryo-electron microscopy imaging of cryo-vitrified thin layers of solutions containing 94 bp-long DNA minicircles that were either covalently closed or doubly–gapped reveals molecular details of their structure. The graphics by J. Dorier and A. Amzallag.
For more information, see the paper by Demurtas et al. in this issue (Nucleic Acids Res. 2009; 37, 2882–2893).
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