Four years ago, Dr. William Summerlin, then a clinical researcher at Stanford University, startled the scientific world by reporting that he had discovered a way to avoid the reaction that has resulted in the failure of so many transplant operations: the tendency of the body's immune system to destroy foreign tissue. But other scientists were unable to repeat Summerlin's experiments, and skepticism about his results grew steadily. Earlier this spring Summerlin, who had since moved to New York City's Sloan-Kettering Institute for Cancer Research, was accused by colleagues of painting the skin of some laboratory mice to make it appear that...
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