A shellfish that glows in the dark has many potential new uses in the management of conditions such as rheumatoid arthritis, kidney disease and asthma. Husband and wife team Robert and Jan Knight have spent 14 years studying the common piddock. Working from a laboratory in their own home in Plymouth, England, the scientists have purified the piddock's luminescent substance which they have called Pholasin. They hope ths substance may replace radioactive chemicals used in medical diagnosis and so develop safer medical tests.

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