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Male sea lampreys, often called vampire fish, have a long ridge running across their backs that contains a long row of brown fat cells. In mammals, this fat is used to regulate body temperature.
Michigan State University researchers are the first to identify a stress hormone in the sea lamprey, using the 500 million-year-old species as a model to understand the evolution of the endocrine system.
- In medieval musical notation, a sign or neume denoting a shake or trill.