For the University Medical Center Utrecht we are developing a VR course on how to work sterile with cell cultures within a lab. The VR experience allows students to practice how to this work, prior to entering the real lab. In VR they can learn learn the right procedures but also experience common mistakes by doing. An advantage is that mistakes can be detected automatically, followed by appropriate feedback. There is no need for a mentor to monitor them while doing the exercise, as would be in a real life lab. The experience will register data to help monitor the effectiveness of the application.