HomeResearchResearch environment and cultureAnimal researchHarms and benefitsSeverity levels of our animal research – data archive Share Home Research Research environment and culture Animal research Harms and benefits Severity levels of our animal research – data archive 2023 2022 2021 Figures include animals at the CRUK Manchester Institute. There were 6,029 unlicensed procedures not rated with a severity banding. 2020 2019