Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain
the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in
Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles
and JavaScript.
The paper by Li et al, this issue, identifies protein markers for tissue degradation assessment. The cover shows an artistic interpretation of two-dimensional fluorescence difference gel electrophoresis analysis of 293T cells after an experimental cold ischemic time of 1 hour.