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Research and Development costs	12 Months Ended
Research and Development costs	Dec. 31, 2019
Research and Development costs
Research and Development Costs	16. Research and Development Costs Research and development costs amounted to € 46,491,000 in 2019 (2018: € 29,514,000, 2017: € 31,153,000) and comprise allocated employee costs, the costs of materials and laboratory consumables, the costs of external studies including, amongst others, clinical studies and toxicology studies and external research, license- and IP-costs and allocated other costs.