Medicine: Mitochondria

An ostrich egg may be considered a single living cell. Big, too, is a single nerve cell which runs along an elephant's spine. The structure of these monster cells is practically the same as a microscopic cell in a rabbit's liver, of which some 980 are required to span one inch.

All such cells contain a small spherical body called a nucleus, surrounded by a soft, jelly-like material called cytoplasm. Dotting the cytoplasm are tiny granules called mitochondria, whose function in life has been a mystery to physiologists.

Last week Professor James Walter Wilson, 39,...

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