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    Does "signature" here mean "signal"?

    Two dictionaries have been checked; failed to reach OneLook from here.

    First, the team addressed the problem of the fluorescent chemical group. Why was it required for resveratrol to rev up SIRT1 in the test tube? Instead of dismissing the result as an artifact, the researchers surmised that the chemical might be mimicking molecules found naturally in the cell. These turned out to be a specific class of amino acid, the building blocks of proteins. In nature, there are three amino acids that resemble the fluorescent chemical group, one of which is tryptophan, a molecule abundant in turkey and notable for inducing drowsiness. When researchers repeated the experiment, swapping the fluorescing chemical group on the substrate with a tryptophan residue, resveratrol and similar molecules were once again able to activate SIRT1.
    “We discovered a signature for activation that is in fact found in the cell and doesn’t require these other synthetic groups,” said Hubbard, first author of the study. “This was a critical result, which allowed us to bridge the gap between our biochemical and physiological findings.

    New Study Validates Longevity Pathway | HMS

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    Re: Does "signature" here mean "signal"?

    I would say that it's closer to definition #3 here.
    Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.

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