Hilda Tracy worked in Rod Gregory’s physiology laboratory at the University of Liverpool, before studying and graduating in medicine. She subsequently joined Gregory’s academic team (1958), staying in the department until his death in 1990. She performed seminal work on the isolation and characterization of the acid-secretory hormone gastrin, the first gastrointestinal hormone to be sequenced. Subsequent investigations with Gregory laid the foundation for gastrin radioimmuno-assay to become a reliable diagnostic test for Zollinger-Ellison tumours. She retired in 1993.

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