The team of MIT, Harvard, and the Dana-Farber Cancer Institute have developed an additive manufacturing method in which prints contain chemicals that affect living organisms. Researchers used various chemicals in the 3D printing process. Thanks to this, they were able to cause specific reactions in microorganisms with which they coated printed objects. In response to the preparations contained in the printout, the microorganisms changed color or emitted light. Printed objects can control the behavior of organisms. Scientists called them hybrid living materials. The purpose of further work is to prepare a tool enabling the production of objects as well as devices with living elements, whose actions will be predictable.