Notwithstanding the provisions of Article L. 4211-1 and those of the first paragraph of Article L. 5124-2, Institut Pasteur remains authorised to ensure, in accordance with its statutes, the preparation and distribution of attenuated or non-attenuated viruses, therapeutic sera, modified or non-modified toxins, and in general the various products of non-chemically defined microbial origin which may be used, in any form, for diagnosis, prophylaxis or therapy, as well as allergens.