Though the payoffs in transplant sur gery are still distressingly few, hopes remain high; both the number and vari ety of transplant operations are increasing. Trouble is, the human body has a habit of trying to reject any tissue or organism that is foreign to its own chemistry. Only with transplants between identical twins is there reasonable hope of long-term success. Among other people, the rejection reaction is always present, though it varies in intensity.* To some Manhattan researchers, this very variation offered new hope for transplant success. In Science, the in vestigators report a new technique for predicting...
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