COVER Tiled confocal microscopy image of a developing zebrafish embryo at single-cell resolution, less than 1 day after fertilization. Single-cell RNA sequencing can be used to generate high-resolution maps of gene expression activity as embryos develop into fish and amphibians. See pages
967,
eaar3131,
eaar5780, and
981.
Image: Frederique Ruf-Zamojski and Sean Megason