Article first published online: 2 MAY 2013 DOI: 10.1002 / anie.201209336 (frogheart.ca)
Angewandte Chemie International Edition Article first published online: 12 FEB 2014 DOI: 10.1002 / anie.201308625 (frogheart.ca)
Once the strain is removed, the tunnels spring back into shape, ready for the next use (Angewandte Chemie, DOI: 10.1002 / anie.201004838). (newscientist.com)