Science: Composite Chicks

The day of men made from bits and pieces may be distant, but it is already possible to replace the head of an embryonic chicken. Last week Yale University told how Mira Pavlovic, 28, a visiting research associate from Yugoslavia, performs the graft, operating on eggs that have been incubated for 33 to 40 hours. At this point the embryo is 0.2 in. long, and the blood system is so primitive that the organism does not bleed.

Following a technique originally developed by another Yugoslav, Petar N. Martinovitch, she cuts a small square hole...

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