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BOSTON (AP) -- A Florida man accused of carrying out Wall Street's largest insider-trading scheme is being remembered as an excellent student of ethics in his college days.

Former hedge fund portfolio manager Mathew Martoma is accused of using inside information about a drug trial to engineer a scheme that reaped a quarter-billion dollars in illegal profits.

He was arrested Nov. 20 at his Palm Beach County home on charges of securities fraud and conspiracy. His lawyer says there was no misuse of secret information.

Ronald Green is a professor at Dartmouth College and supervised Martoma at the National Institutes of Health early in the suspect's first career in health. He says Martoma had very good training in bioethics.

Green says it's sort of a tragic story if there's any truth to it.

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