This fluorescent micrograph shows the developing egg chambers within the Drosophila melanogaster (fruit fly) ovary. The egg chambers house the maturing eggs - these are the cells at the tips of the egg chambers that face towards the outside of the image. The other cells present are called nurse cells; they occupy the rest of the chamber and assist the developing egg cells as they increase in size over time to produce a mature egg. The specimen has been stained with phalloidin, which marks the actin in the cells green and a nuclear marker that highlights the nuclei in red.