Non-selective versus selective media.
The non-selective media on the right allows of the growth of several different bactarial species and is overgrown with bacteria (whitish lines). While the plate on the right selectively only allows the bacteria Neisseria gonorrhoeae, to grow (white dots).
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"Neisseria gonorrhoeae 01."
http://commons.wikimedia.org/wiki/File:Neisseria_gonorrhoeae_01.png
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