Hello,
Human cells (the living building blocks of our bodies) can be grown by themselves in petri dishes in the laboratory. They form weird mysterious structures when they are stressed, and we study what these structures are (what they do, and why the form). We stress human cells in different ways: they can be stressed by heat (about as hot as when you have a bad fever), arsenic, hydrogen peroxide (same stuff that people put on scrapes sometimes and it fizzes), cold (as cold as a refrigerator), or low oxygen conditions.
Here’s a photo of what some human cells look like after they are stressed (this is from the website of the lab I work in): http://www.colorado.edu/lab/parkergroup/what-we-do
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