Border cells (Drosophila)
The border cells are a cluster of 6–8 cells that migrate in the ovariole of the fruit-fly Drosophila melanogaster, during the process of oogenesis. A fly ovary consists of a string of ovarioles or egg chambers arranged in an increasing order of maturity.
Source: Wikipedia — Border cells (Drosophila) (CC BY-SA 4.0)