We will introduce Advance Online Publication (AOP) on our websites (http://www.nature.com/cr and http://www.cell-research.com) from 23th May.

Each website includes an AOP table of contents, in which papers are listed in order of publication date. Each paper carries a digital object identifier (DOI), which serves as a unique electronic identification tag for that paper. As soon as the monthly issue is printed, papers will be removed from the AOP table of contents, assigned a page number and transferred to that issue's table of contents on the website. The DOI remains attached to the paper to provide a persistent identifier.

More information about Advance Online Publication (AOP) http://www.nature.com/neuro/aop/

We hope the rapid online publication is valuable for both readers and contributors.

Editorial Office of Cell Research

May 12, 2006