For immunoelectron microscopic localization of isopenicillin N synthase (IPNS), glutaraldehyde-fixed mycelium of Penicillium chrysogenum PQ-96 was dehydrated by progressive lowering of the temperature and embedded into Lowicryl K4M at -3 5°C . This procedure resulted in good structural preservation such that the method of on-section labelling using antibody to IPNS from Cephalosporium acremonium CO 278 with the indirect antibody-gold technique could be successfully applied. By this method IPNS was localized in vesicular compartments belonging probably to the Golgi body and in the cell wall.

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