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Previous Volume 342:902 March 23, 2000 Number 12

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By Nancy L. Segal. 416 pp., illustrated. New York, Dutton Books, 1999. $24.95. ISBN 0-525-94465-6.

The study of twins is a fundamental tool of genetic epidemiology and thus is important to all medical and behavioral sciences. Even in this era of study of the human genome, the definition of phenotypic boundaries in many fields still requires refinement, and genetic and environmental influences require further exploration. Despite their importance, I have heard the results of twin studies described as "opaque" by medical colleagues. They need look no further than Entwined Lives, by Nancy Segal, for clarification. The book covers the various facets of twin research, particularly in the study of behavior, in an accessible and sensible . . . [Full Text of this Article]

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