WIM VAN EGMOND / SCIENCE PHOTO LIBRARY WIM VAN EGMOND / SCIENCE PHOTO LIBRARY
Light micrograph of a colony of the fungus Penicillium chrysogenum growing in a Petri dish. This fungus is a source of the antibiotic penicillin G, which can be seen as spherical droplets of exudate (extrolite, yellow) on the colony's surface. Magnification: x20 when printed 10 centimetres wide.
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