A bright protein cluster inside a nucleus is not, by itself, evidence for a liquid droplet. In living fruit-fly embryos, researchers watched Dorsal, a protein that helps regulate the developing body plan. They changed the number of places it could bind on regulatory DNA. More binding sites produced stronger, more persistent local protein accumulations. A model based on binding, diffusion and cooperation between nearby binding events reproduced key features without requiring proteins to form a separate liquid-like phase. The result does not rule out droplets elsewhere. It gives a concrete alternative to test: perhaps the DNA binding sites help explain the crowd. New Science Advances paper: doi.org/10.1126/sciadv.aeh10…