This is an eye of a four day-old zebrafish embryo, with the lens showing red from a fluorescent reporter transgene inserted into the genome using CRISPR/Cas9 technology. The transgene is also expressed in the cells of developing mechanosensory organs - neuromasts, whereas neuronal tracts in the head are labelled in cyan by antibody staining and imaged by confocal microscopy. The image was selected as one of the winners of the Wellcome Trust Image Awards 2017. Credit: Ingrid Lekk and Steve Wilson, University College London.
