Depicted is a C. elegans hermaphrodite carrying a lys-7::gfp transgene. In this animal, GFP expression is controlled by the gut-specific lysozyme-7 promoter. The image is an overlay of fluorescence and Nomarski images (images merged using Adobe Photoshop). Image adapted from Fig. 1 in [79]. Copyright © American Society for Microbiology, Molecular and Cellular Biology, 27, 2007, 5544–5553, doi:10.1128/MCB.02070–06.