ESVP/ESTP/ECVP Congress 2024 -- In recent years, the development of new drug modalities has underlined the importance of nonhuman primates in biomedical research. Simultaneously, the central nervous system (CNS) has gained importance as a target for different drug modalities including gene therapeutics (Gao et al., 2024). Therewith, the CNS is often closely examined and a popular subject of lively discussions on the cause and significance of unusual findings. Herewith, the authors describe an exceptional finding in the brain of a cynomolgus monkey (Macaca fascicularis) of unknown etiology.

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