Heredity: The Lyon & the Mouse

The 1,500 experts in medical and related sciences who gathered last week in Manhattan's Americana Hotel spent hours listening intently to highly technical discussions of sex chromosomes, enzyme systems and skeletal development. In the Imperial Ballroom, earphones provided simultaneous translation in three languages. It was the second international conference on congenital malformations sponsored by the National Foundation-March of Dimes. The world's outstanding researchers were tackling an immense problem: one baby out of every 15 is born with some defect, be it physical, mental or chemical. In the U.S. alone, that means more than 250,000 victims each year.

Making Mosaics. At...

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