University of Basel Nov 18 2025 Our body's "blood factory" consists of specialized tissue made up of bone cells, blood vessels, nerves and other cell types. Now, researchers have succeeded for the first time in recreating this cellular complexity in the laboratory using only human cells. The novel system could reduce the need for animal experiments for many applications. The bone marrow usually works quietly in the background. It only comes into focus when something goes wrong, such as in blood