Sensor targets.

We are delighted to write these editorials on what has been a very exciting project involving world leading experts on the development of sensors and imaging agents for these two themed issues on sensor targets and imaging agents. Through the coordination and editing of these two issues we were able to take advantage of each other’s extensive knowledge in the areas of sensing and imaging. The choice of who to invite to contribute to the issues was an enjoyable one and included established and up and coming researchers in the overlapping areas of sensing and imaging. We were delighted by the overwhelming and positive response from invitees and their willingness to contribute cutting edge highlight articles, tutorial reviews and critical reviews to Chemical Society Reviews. Chemical Society Reviews is a Departments of Chemistry and Molecular and Cell Biology, Howard Hughes Medical Institute, Helen Wills Neuroscience Institute, Lawrence Berkeley National Laboratory, University of California, Berkeley, Berkeley, CA 94720-1460, USA. E-mail: [email protected] b School of Chemistry, Trinity Biomedical Sciences Institute, University of Dublin, Trinity College Dublin, 152-160 Pearse Street, Dublin 2, Ireland. E-mail: [email protected] c Department of Chemistry, University of Bath, Bath, BA2 7AY, UK. E-mail: [email protected]