WIM VAN EGMOND / SCIENCE PHOTO LIBRARY WIM VAN EGMOND / SCIENCE PHOTO LIBRARY
Light micrograph of the fungus Penicillium chrysogenum (bottom) inhibiting the growth of Bacillus subtilis bacteria (top). The inhibition, caused by antibiotics, including penicillin G, secreted by the fungus, can be seen in the clear ring between the two species.
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