Researchers at the University of Oulu in Finland have developed a new method for creating functional blood vessels within lab-grown organoids. These simplified organ models mimic the structure and functions of real organs, and the addition of vascular networks enhances their utility in medical research. By utilizing chicken embryo membranes, the team successfully formed blood vessels that connect to a circulatory system for oxygen, marking a significant advancement in organoid technology. This innovation is expected to accelerate studies on diseases such as kidney failure, cancer, diabetes, and hypertension.