Preface

These are exciting times for RNA molecular biologists! With the discovery of thousands of new noncoding RNA (ncRNA) transcripts in the last few years, and especially the new human genome transcripts, great opportunities and challenge are provided for determining functions in normal and disease states. This text is an outgrowth of a special issue of *IJMS* devoted to regulation by non-coding RNAs and contains both original research and review articles. In all there are 50 peer-reviewed articles presented that were submitted to the Journal within a period of 8 months. An attempt has been made to provide an up-to-date analysis of this very fast moving field and to cover regulatory roles of both microRNAs and long non-coding RNAs. Multifaceted functions of these RNAs in normal cellular processes, as well as in disease progression, are highlighted. We hope the readers will enjoy the articles and find the concepts presented challenging.

Nicholas Delihas

*Guest Editor*

Reprinted from *IJMS*. Cite as: Stoller, M.L.; Chang, H.C.; Fekete, D.M. Bicistronic Gene Transfer Tools for Delivery of miRNAs and Protein Coding Sequences. *Int. J. Mol. Sci.* **2013**, *14*, 18239-18255.

#### *Article*
