Day 51 of #LMB365 shows the embryonic germ cells of the mouse. Using immunofluorescence and confocal microscopy Ross Hill (@rosshill92) visualises the developing testis of a mouse embryo where the cells that ultimately produce sperm in adult mice are stained green. These cells are unique in that they are solely responsible for passing genetic information from one generation to the next. These cells are of particular interest to scientists in the group of Gerry Crossan in the PNAC Division who study DNA repair in germ cells.