You can buy petri dishes with separations in them like this:

Petri dish with "grid"

I have studied biology and biochemistry and never come across one of these before. What cell culturing / experiment would this be used in?

** Edit: **

Perhaps it's not cell culturing but instead used for containing different macroscopic organisms like woodlice or something? But then I'd have thought they'd climb over the divisions.

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    $\begingroup$ I am not sure about 'vertical' division. But in general there is article describing use of Divided Petri Dishes $\endgroup$ – Dexter Jul 9 '19 at 9:55
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    $\begingroup$ We grow plant explants on petri dishes. They grow paifully slowly, so having several on one dish is major space-saver. Howewer, I wouldnt use prefabricated divider. Drawing marker lines on the bottom is usually enough to keep track of what is what. $\endgroup$ – BagiM Jul 10 '19 at 7:07

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