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Notes to the consolidated balance sheet - Inventories (Details) - EUR (€)
€ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Inventories    
Inventories € 401 € 373
Laboratory inventories    
Inventories    
Inventories 434 406
Inventories write-down    
Inventories    
Inventories € (33) € (33)