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The Polymerase Chain Reaction (Paperback, 1994 ed.)
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The Polymerase Chain Reaction (Paperback, 1994 ed.)
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James D. Watson When, in late March of 1953, Francis Crick and I
came to write the first Nature paper describing the double helical
structure of the DNA molecule, Francis had wanted to include a
lengthy discussion of the genetic implications of a molecule whose
struc ture we had divined from a minimum of experimental data and
on theoretical argu ments based on physical principles. But I felt
that this might be tempting fate, given that we had not yet seen
the detailed evidence from King's College. Nevertheless, we reached
a compromise and decided to include a sentence that pointed to the
biological significance of the molecule's key feature-the
complementary pairing of the bases. "It has not escaped our
notice," Francis wrote, "that the specific pairing that we have
postulated immediately suggests a possible copying mechanism for
the genetic material." By May, when we were writing the second
Nature paper, I was more confident that the proposed structure was
at the very least substantially correct, so that this second paper
contains a discussion of molecular self-duplication using templates
or molds. We pointed out that, as a consequence of base pairing, a
DNA molecule has two chains that are complementary to each other.
Each chain could then act ." . . as a template for the formation on
itself of a new companion chain, so that eventually we shall have
two pairs of chains, where we only had one before" and, moreover, "
..."
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