Scientists have used HeLa cells in hundreds of thousands of life sciences experiments, but scientists can’t always reproduce the findings.

To get to the bottom of the lack of reproducibility of these cloned descendants of human cancer cells, a group of system biologists embarked on a massive project: molecular cell measurement.

Here, Ruedi Aebersold, a professor at ETH Zurich, explains the project—and why reproducibility is so important.

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