Yes, tissue or cell culture analyses are often less expensive. With regard to in vitro experiments however, it should be considered that cell cultures that are not produced from human cells originate from animals. The material for the cell cultures can be collected from a biopsy, a slaughtered animal or an animal euthanised for the purpose of the experiment. Whenever animals are used, costs are incurred for keeping, breeding and using the animals. The care of the animals and the legally stipulated training of the persons providing this care are reflected in the costs. These expenses are not incurred in research projects for which no animal experimentation is required. This is another reason why – whenever possible – methods that do not require live animals are used.