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On March 12, Watson sent Delbrück a letter, illustrated with rough sketches, discussing their new model. He warned his mentor not to tell Pauling about it
until they were more certain of their results, but Delbrück, never one to keep secrets, immediately passed the letter around. Pauling's mind raced as he read it. He saw immediately
that the Cavendish structure was not only chemically reasonable but biologically intriguing. "The simplicity of the structural
complementariness of the two pyrimidines and their corresponding purines was a surprise to me-a pleasant one, of course, because
of the great illumination it threw on the problem of the mechanism of heredity," he said.
A few days after seeing Watson's letter, Pauling wrote a colleague, "You must, of course, recognize that our proposed structure
is nothing more than a proposed structure. There is a chance that it is right, but it will probably be two or three years
before we can be reasonably sure. . . ."
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