Bone marrow is much more than the mushy stuff inside your bones, it’s a prime piece of real estate where your blood cells are made. To increase our understanding of this nifty little blood cell factory, scientists have now developed a new form of artificial bone marrow in a breakthrough that could lead to lifesaving treatments for people suffering from blood conditions such as leukemia.
Source: http://www.iflscience.com/health-and-medicine/labmade-artificial-human-bone-marrow-is-pure-scientific-wizardry/