https://phys.org/news/2018-08-newly-cytoskeleton-cancer-cells-survive.html

The researchers were studying the protein gamma-tubulin, which is important for the cells' life-cycle, under the microscope when they reacted to the protein's presence in so many different locations in the cells they were investigating.

"Gamma-tubulin is a sticky protein so some people first thought that what we were seeing under the microscope was a contamination of the samples. But that was not correct, because when we removed this protein from the cell, it died. So it could not only be a matter of contamination, but had to be something with an important function for the cell's survival."