Surface tension drives segregation within cell mixtures

What does a mixture of two different kinds of cells have in common with a mixture of oil and water? The same basic force causes both mixtures to separate into two distinct regions.

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<p><a href="http://www.physorg.com/news142517341.html">Surface tension drives segregation within cell mixtures</a></p> <p>What does a mixture of two different kinds of cells have in common with a mixture of oil and water? The same basic force causes both mixtures to separate into two distinct regions.</p>