Confluent layer of epithelial rat kangaroo kidney cells grown on a micropatterned island of glass slides, the shape of which corresponds to the continental U.S. Cell nuclei were dyed blue; cell borders visualized using a fluorescent antibody. The scale bar is 100 μm.

From the article:

Universal Area Distributions in the Monolayers of Confluent Mammalian Cells
Gary Wilk, Masatomo Iwasa, Patrick E. Fuller, Kristiana Kandere-Grzybowska, and Bartosz A. Grzybowski
Phys. Rev. Lett. 112, 138104 (2014)

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