The researchers scrutinised the brain scans to see if they could find any patterns that tallied with the protein level results from the lumbar puncture tests.

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There may be an optimal level of protein production inside brain cells needed for learning.

FORBES: Magazine Article

Yet despite the differences in protein and fat intake, the level of body fat increased by essentially the same amount among all the participants.

WSJ: New Ways Calories Can Add Up to Weight Gain

Tenovin was found to kill the cancer in Leukaemia patients without affecting the level of a tumour-suppressing protein.

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This enables the protein shell of the virus to be analysed at the atomic level - something a billion times smaller than a pinhead.

BBC: Synchrotron yields 'safer' vaccine

They might sound like the stuff of science fiction, but at their most basic level these medical micro-robots are man-made protein "machines" that produce movement through chemical reactions.

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Asian people tend to have a high level of "good" cholesterol because they carry a defective version of this protein.

BBC: Drug raises 'good' cholesterol