Omega-3 is a long-chain fatty acid critical for brain structure and function.

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It was largely the function of now-obsolete trade union contracts and corporate structure.

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But the Merck-bound scientist's main interest has been in the structure and function of proteins, the building blocks of all living things and the basis for most drugs.

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In general, an eyelash-growth claim "would indicate an intent to affect the structure or function of the body, and thus, cause the product to be a drug, " which would require FDA approval, says Shelly Burgess, a spokeswoman.

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Researchers used x-ray technology to examine the structure of the enzyme, which changes depending on its function.

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"Where we have seen certain bonds under-perform, it's normally a function of poor credit quality, weak structure or overly aggressive pricing, " he said.

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