A protein with its electron density cloud displayed.

Electron density is a feature of electron density puzzles in Foldit.

Electron density is the probability that an electron is present at a point in space. The probability is usually determined using X-ray crystallography.

In electron density puzzles, there's an electron density tool, which displays an electron density "cloud". The display can be adjusted in various ways to help reveal features like the shape of sidechains in the cloud.

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